The definition of the term “vertical foreclosure” or VF used by Maris Lane Jensen, now Ph.D., in her doctoral thesis Finance and Factory-Built Housing is as follows. Jensen means in “…her research on manufactured housing markets, vertical foreclosure refers to an anti-competitive market mechanism where a dominant, vertically integrated firm uses its control over an upstream stage of the supply chain to restrict access to downstream rivals, effectively foreclosing (squeezing out) those competitors from the market.” From the abstract of Maris Jensen’s doctoral thesis Finance and Factory-Built Housing for the University of California (U.C.) at Berkley is the following (bold/highlighting added). “Upstream manufacturers extend “floor plan” financing to downstream retailers buying homes for their lots, and restrict output in the downstream market. Floor plan financing acts as the vertical restraint a manufacturer needs, during two decades of a growing housing shortage, to distort competition closer to the inefficient monopoly outcome.” MHProNews notes that while Jensen’s thesis arguably merits certain refinements and/or clarifications that are specified below, it is a timely, insightful and a useful research document. In terms of housing keeping, MHProNews further notes that because converting a PDF into a MS Word doc and then transferring that to a website editor can result in some formatting glitches, when precision is absolutely necessary, the original PDF should be carefully viewed.  That said, a reasonable effort has been made for MHProNews readers and other researchers to get the following correct and to further check and recheck the following by two different third-party artificial intelligence (AI) systems reviewing the text below against the original by Jensen. It should further be noted that MHProNews previously explored a different but related Jensen research paper linked here.

MHProNews cautions reader/researchers not to think that it is only floorplan (wholesale inventory) lending that can be used to “distort competition closer to the inefficient monopoly outcome.” Combining insights from Jensen’s research and that of others who have probed consolidation and purported manufactured housing market manipulation that could constitute antitrust violations can yield a robust picture of the Consolidation Thesis for manufactured housing.

Per Gemini in #12 below: “Furthermore, the article [i.e.: this article] strengthens Dr. Jensen’s thesis by offering constructive, fact-based refinements…”

 

 

Gemini (see #6 below for context) said the following.

MHProNews remains the primary manufactured housing trade media entity to cite, analyze, and unpack Jensen’s doctoral research, linking her empirical analysis of vertical foreclosure and floor plan credit restraints to its ongoing industry consolidation thesis. Conversely, trade associations in the Manufactured Housing Institute (MHI) orbit and MHI-aligned trade publications have largely ignored her findings, as her research implicates major integrated MHI member firms (e.g., Clayton Homes, Cavco Industries, Champion Homes (SKY)) in practices that suppress independent retail competition and restrict output.

One of several useful charts and tables in Jensen’s thesis is Table 1.17. MHProNews muses from the perspective of public officials or other investigators: have you seen a similar table from the Manufactured Housing Institute (MHI)? Is such a table publicly available today on the public-facing side of their website? If not, why not? Doesn’t it benefit the consolidated lenders in manufactured housing to avoid having the following options available, as MHARR, Doug Ryan or the Underserved Mortgage Markets Coalition (UMMC) have each in their own way spotlighted?

 

 

The pre-publication draft of this article submitted to xAI’s Grok and Google‘s artificial intelligence (AI) powered Gemini is linked here.

That noted, Jensen’s academically reviewed thesis ought to be considered as part of the broader research by others into the 21st century manufactured housing market, including the amended claim filed on behalf of residents of land-lease manufactured home communities.

Antitrust concerns regarding the manufactured housing market have a significant academic, legal, nonprofits, industry professionals, media, public officials plus others who have shined a light on why manufactured housing is underperforming during an affordable housing crisis.

Jensen cited vertical foreclosure (VF) 13 times and used the abbreviation VF 30 times in her thesis, including this instance quoted below.

“As integrated flooring motivated by VF would imply, a plausibly exogenous increase in the share of integrated flooring is associated with both higher prices and lower quantities in a downstream market.”

Why is manufactured housing underperforming in the 21st century? Jensen strongly implies that vertical foreclosure by integrated floorplan lending are: “associated with both higher prices and lower quantities in a downstream market.”

This expert MHVille facts-evidence-analysis (FEA) is well underway.

 

 

1.  According to Maris Lane Jensen’s Abstract

“Factory-built housing is the largest source of unsubsidized affordable housing in the United States, but the production of homes built in factories has fallen from more than fifty percent of single-family housing starts in the mid-1970s to under ten percent today. This is surprising, given the myriad advantages of factory production — the economies of scale, increased production capacity, more consistent quality control, and more efficient use of resources — and given that the US is experiencing what government officials refer to as a “housing affordability crisis” (Maxine Waters 2023). Affordable housing is where factory-built housing has the comparative advantage. Larger, higher-end homes offer site-built developers higher profit margins and the ability to spread fixed costs, but factories can profitably build small. The average factory-built home is around half the size of the average site-built home, and approximately half the price per square foot. The disappearance of homes built in factories hence has a disproportionate effect on low-income homeowners and renters, and an impact on long-term economic growth and inequality.

This dissertation explores the economic and social phenomena that might explain the decades-long stagnation of factory-built housing at ten percent of housing starts, many of which involve finance. Housing and finance are inextricably linked. For all but the wealthiest, buying a home requires financing, and a home is usually the most expensive thing a household owns. Housing is especially important for households in the bottom half of the wealth distribution — those households most likely to be considering factory-built homes. Real estate constitutes more than half of their aggregate portfolio holdings.

In Chapter 1, I place the starter home, and then the manufactured home in particular, in historical context. I discuss the various rounds of federal involvement in housing finance, and the subsequent dominance of a loan product that is distinctly American: the 30-year, fixed rate mortgage. I survey the relevant research on housing affordability and the construction shortage, and update previous studies to show the growing deficit in entry-level housing supply. I detail the rise and fall of factory-built housing in the US, and the disproportionate effect on renters and low-income homeowners. I review the grocery list of common explanations for the disappearance of manufactured homes; I use new data to refute some arguments, and propose others. I show that Home Mortgage Disclosure Act (HMDA) data are not representative of the universe of manufactured home loans — that the actual number of manufactured home loans in a given year and state can be over 50 percent greater than the number of reported HMDA loans, with primarily chattel loans going unreported.

In Chapter 2, I focus on inventory financing, and the vertical relationships between manufacturers, lenders, and retailers. Using publicly claimed security interests and the movement reported on oversize trip permits, I follow each manufactured home in Texas from factory to dealership to buyer, as it transforms from finished goods to wholesale collateral to consumer collateral, to show that the restriction in factory-built housing supply is consistent with market foreclosure. Upstream manufacturers extend “floor plan” financing to downstream retailers buying homes for their lots, and restrict output in the downstream market. Floor plan financing acts as the vertical restraint a manufacturer needs, during two decades of a growing housing shortage, to distort competition closer to the inefficient monopoly outcome.

In Chapter 3, I detail the manufactured housing data gathered and merged for this dissertation, and place it within the relevant regulation and wider context. I discuss the potential problems with each data source, and my solutions.”

2. From a WORD.doc search of the 209 pages of her thesis, Jensen used the word “consolidation” 5 times. In each of the following, some context is offered below by providing text before and after the word search for “consolidation.”

a)

…By 2010, more than three times as many new RVs were shipped than new manufactured homes: 242,284 RVs versus some 50,000 manufactured homes. RVs are a luxury good, so the two industries are quite different, but as both began life in the 1920s as travel trailers, they share the same history and original market structure. Even now, manufactured homes and RVs are occasionally still sold together, and pricewise, the average RV costs the same as the average manufactured home. What is markedly different is the level of consolidation, the vertical integration, and the financing practices within each industry. The RV industry is much more competitive, more like the car industry, whereas the high transportation costs involved in manufactured housing mean highly local markets where manufacturers have local monopoly power. In the early 2000s, independent lenders began dropping out of the floorplan lending market – and out of manufactured housing lending in general – and integrated lenders began stepping in.

b)

…In Table 2.1, we see that the numbers of manufacturers, plants and retailers in the industry have dropped by half since the 1990s. By contrast, the numbers of floor lenders – both independent floor lenders and floor lenders who are integrated with manufacturers – have remained stable. This masks massive change and consolidation. In late 2002, the independent Conseco Finance, who provided over 20 percent of the industry’s flooring, filed for bankruptcy. The second largest lender, Deutsche Financial, liquidated its flooring portfolio soon after. An estimated 40 percent of the industry’s flooring, suddenly gone.

Integrated lenders step in, offering floor plan financing not only for their parent manufacturer’s homes, but for their competitors’ homes. The share of inventory floored by integrated manufacturers rises to 87 percent, alongside the integrated share of manufactured home production. Aggregate production drops. The manufactured housing share of single-family housing starts drops. These are strong trends that are consistent with vertical foreclosure…

 

c)

The manufactured housing industry has seen waves of consolidation over the past few decades, both horizontally and vertically. Figure 3.3 shows the top ten builders per year in Texas by manufacturing housing shipment market share from the mid 1990s through today, with shipments from all other builders grouped into “Other.” The increasing consolidation is evident. Figure 3.4 goes back further in time – to the 1970s, when no manufacturer was dominant.^[89]

Figure 3.5 repeats the breakdown for manufactured home builder market share in Oregon from 1990 through today, using data from Oregon’s Manufactured Home Ownership Document System (MHODS). While increased consolidation is evident here, as well, the relative builder market shares in Texas and Oregon are quite different. Figure 3.6 repeats the analysis for Nevada, using data from the Nevada Housing Division that begins in 1981. Again, the industry becomes increasingly consolidated, but the builder market shares are different. Manufactured housing markets are – as the high transportation costs would predict – highly local. Downstream retailers do face more competitive markets, though, as illustrated in Figure 3.7.

Tables 3.7 and 3.8 list an incomplete, but still extensive, history of mergers and acquisitions in the manufactured housing industry – in manufacturing, retail, and lending – from 1995 through today.^[90]

 

3. Jensen’s thesis used the term “consolidated” twice.  Here are those and the context in her thesis.

a)

In the 1990s, the market boomed again as credit standards for manufactured home loans weakened. As a dealer in Louisiana told Grissim (2006), “If you could make an X you could get a loan.” The industry became increasingly consolidated, both horizontally and vertically – the top three manufacturers^[28] commanded 50 percent of the industry, and the largest manufacturers began integrating into distribution – leading to increased production through economies of scale.

[28] Clayton Homes, Fleetwood Homes, and Oakwood Homes

[MHProNews note a: the above information is either a typo or otherwise flawed (see this document plus this AI cross check). Champion Homes was #1, Fleetwood Homes was #2, and Oakwood Homes was #3 in 1998. Clayton was #4 that year.]

MHProNews Annotation Table 1	HUD Code Homes
HUD Code Builder	in 1998
Champion Enterprises	68,264
Fleetwood Enterprises	66,222
Oakwood Homes	38,237
Clayton Homes	28,429
	201,152
Total Production in 1998	373,143
Percentage of market by top 4	0.539074832

 

b.

 

[MHProNews note b: the above information is either a graphical rendering error or otherwise flawed/contradicted by sources such as the National Association of Realtors (NAR- see below). A more common figure is that during the mobile home era pre-HUD Code era construction was roughly 30 percent or 1/3rd of single-family housing starts.]

 

 

c)

Figure 3.5 repeats the breakdown for manufactured home builder market share in Oregon from 1990 through today, using data from Oregon’s Manufactured Home Ownership Document System (MHODS). While increased consolidation is evident here, as well, the relative builder market shares in Texas and Oregon are quite different. Figure 3.6 repeats the analysis for Nevada, using data from the Nevada Housing Division that begins in 1981. Again, the industry becomes increasingly consolidated, but the builder market shares are different. Manufactured housing markets are – as the high transportation costs would predict – highly local. Downstream retailers do face more competitive markets, though, as illustrated in Figure 3.7.

3. Jensen uses the term “monopoly” or “monopolies” some twenty (20) times in her thesis. Among those sources cited where James Schmitz Jr. and his colleagues, which have often been cited by MHProNews and/or MHLivingNews.

• a) “Upstream manufacturers extend “floor plan” financing to downstream retailers buying homes for their lots, and restrict output in the downstream market. Floor plan financing acts as the vertical restraint a manufacturer needs, during two decades of a growing housing shortage, to distort competition closer to the inefficient monopoly outcome.” (Page 2).
• b) “The RV industry is much more competitive, more like the car industry, whereas the high transportation costs involved in manufactured housing mean highly local markets where manufacturers have local monopoly power.”
• c) 6 of the uses of the term monopoly, monopolization or monopolies occur in this segment (circa page 75) of her thesis.

Consider the ex-post monopolization model of O. Hart and Tirole (1990), adapted for manufactured housing. The game is illustrated in Figure 2.1. We have a manufacturer, M, who is a monopoly producer of manufactured homes with marginal cost c. M supplies two downstream retailers, R₁ and R₂, who compete to sell homes in the same local market. The retailers can also buy from a second, higher-cost competitor.

In the first stage of the game, M offers each retailer a contract; the retailers order quantities, and pay. In the second stage of the game, M ships the homes to the retailers; the retailers observe each others’ quantity choices, and set their prices. Downstream competition is Bertrand with capacity constraints, which is sensible here as manufacturers produce to order. Under Kreps and Scheinkman (1983) conditions, the equilibrium is Cournot.

M would like to offer the monopoly price and quantity to both retailers, but as O. Hart and Tirole (1990) point out, as soon as one retailer agrees, M has the incentive to sell more than the monopoly quantity to the other retailer. (M takes the quantity as given for the contracted retailer and reoptimizes quantity for the other retailer). This lowers the profits of the first retailer, making him unwilling to sign in the first place. In other words, M can’t make the full monopoly profit without distorting downstream competition. To restore monopoly power, he needs either control rights over R₁, or to credibly commit to limiting his future production.

 

• d)

And then there is the positive use of credit. Banner (1958) points out that captive finance companies cannot be relied on to react in the way monetary authorities anticipate. While independent lenders tighten lending standards and ration credit as rates increase, the integrated manufacturer — knowing these conditions exist — may take advantage of the situation to enhance his market position. The limitation on credit for his competitors’ products could even be his impetus to provide credit: “At such a time new markets can be invaded and a broader distribution of products achieved.” This is Implication 3. The greater the upstream cost asymmetry, the greater Mś incentive for VF, and the closer we get to the inefficient monopoly outcome. [Page 78].

• e)
  

  Empirical Strategy

  My empirical approach is straightforward. I will compare the data with the implications of foreclosure theory. Does integrated financing result in higher prices and lower quantities in downstream markets? Do retailers with integrated financing gain downstream market share? As the integrated manufacturer’s incentive for VF increases, do markets more closely approach the monopoly outcome? To generate plausibly exogenous variation in the level of integrated flooring in markets, I will use national acquisitions of downstream dealership chains by manufacturers (where some of the acquiring manufacturers provide inventory financing, and some do not). For plausibly exogenous variation in the integrated manufacturer’s incentive for VF, I will use changes in upstream competition generated by the unexpected demand for Federal Emergency Management Agency (FEMA) trailers after Hurricane Katrina, which monopolized the production capacity of manufacturers awarded FEMA contracts throughout the US. [Page 79].

• f)
  

  Defining a Local Market

  The goal here is to determine whether or not manufacturers are using flooring to act monopolistically within local downstream markets, so how we define a local market matters. We want each market to capture retailers in competition with each other, which is not the same thing as retailers within a county, or retailers within some market radius (though the high transportation costs do provide a nice upper bound). We also want the local markets to remain constant, even while the underlying flows of population, production lines and dealerships change considerably over the decades in question. [Page 84].

   

• g)

Upstream Competition and Integrated Flooring …

…If manufacturers are using flooring monopolistically, then, markets should more closely approach the monopoly outcome as the cost of bypassing the integrated manufacturer increases. Prices should rise, and shipments should fall, as competition upstream becomes less fierce. Figure 2.9 illustrates the correlations we expect between the number of homes shipped to a market and upstream competition in our sample, conditional on the market share of integrated flooring.

The Justice Department considers markets with HHI measures below 1,000 competitive, markets with HHI measures above 1,000 moderately concentrated, and markets with HHI measures above 1,800 highly concentrated. As the manufacturer HHI increases beyond 1,800 and markets become less competitive, we see a stronger relationship between shipments and HHI in the panel on the right, which pictures markets in the top quartile of integrated flooring, than is evident for the remaining 75 percent of markets. This is consistent with the integrated manufacturer’s strategic use of flooring for VF: his incentive to distort competition increases with both the HHI and his ability to use flooring monopolistically (the share of integrated flooring in a market).

• h)

…To identify this impact, I use the unexpected national production of FEMA trailers after Hurricane Katrina, which discretely and differentially affected competition in local markets by monopolizing the production capacity of manufacturers that were awarded FEMA contracts for months. [Page 107].

• i)

…every manufacturer in the sample spread production over multiple factories. Plant production capacity is limited, and manufacturers were given deadlines, so this is not surprising. Moreover, Table 2.15 shows that before Hurricane Katrina, prices were not significantly higher for any FEMA Factory than prices for non-FEMA factories, so the results are not due to FEMA monopolizing production in cheaper factories. [Page 107].

From Jensen’s Footnotes.

• j)

53. Schmitz (2020a) suggests that many of the crises facing low- and middle-income Americans – the US housing crisis included – are the result of “toothless” monopolies sabotaging low-cost alternatives that the poor would purchase.

From Jensen’s Bibliography.

• k) Schmitz Jr., James A. (May 2020a). “Monopolies Inflict Harm on Low- and Middle-income Americans”. doi: 10.21034/sr.601.
• l) Schmitz Jr., James A. (Oct. 2020b). “Solving the Housing Crisis Will Require Fighting Monopolies in Construction”. doi: 10.21034/wp.773.

 

4. In a planned follow up to this report on Jensen’s thesis, Finance and Factory-Built Housing, several other terms, brands, and ‘Word’ search insights will be examined.

As a sneak preview, neither MHI nor MHARR are cited in her research. That’s not said to imply that it should (or should not) have been mentioned by Jensen. It is simply a reality that neither national trade group was cited in her work product.

In this initial unpacking of her thesis, as was noted previously, it seems that Jensen believes that “vertical foreclosure” or VF is a contributing factor in industry consolidation and oligopoly style monopolization in manufactured housing. For example, quoting Jensen.

Integrated lenders step in, offering floor plan financing not only for their parent manufacturer’s homes, but for their competitors’ homes. The share of inventory floored by integrated manufacturers rises to 87 percent, alongside the integrated share of manufactured home production. Aggregate production drops. The manufactured housing share of single-family housing starts drops. These are strong trends that are consistent with vertical foreclosure. They might also be consistent with other stories, perhaps efficiency- or demand-based ones. I will show that my results are robust to various specifications and sources of identification, with vertical foreclosure explaining what happens in manufactured housing when integrated manufacturers extend floor plan financing to retailers. [Page 73].

So, Jensen acknowledges in the above that the results she found “might also be consistent with other stories” or factors (bold added for emphasis). Her citations of Schmitz in her work are also consistent with the understanding that other factors point to why the industry is underperforming even as the market share of the big three vertically integrated firms have grown.

 

 

5. Glitches occur not only with humans, but they can also happen with artificial intelligence (AI) too. The initial response from xAI’s Grok both noted the correction by MHProNews of Jensen’s glitch on the share of housing starts, yet repeated that itself. A follow up was used to have Grok examine its initial response and correct itself. See confirmation for accuracy of the discussion transcript with Grok here and the full PDF thread with the initially partially errant response by Grok here. Let’s further note that when Jensen cited Texas manufactured housing data, that is citing a key performance indicator (KPI) from the runaway #1 state for U.S. manufactured housing production and shipments.

Corrected FEA Response on Maris Jensen’s Thesis

You are right. Jensen’s abstract and thesis repeatedly state that factory-built (manufactured) housing production fell “from more than fifty percent of single-family housing starts in the mid-1970s to under ten percent today.” MHProNews flagged this as a glitch (or graphical/data rendering issue), and supporting historical sources confirm the national peak was lower—typically in the ~30–34% range of single-family production/starts in the early 1970s (e.g., ~30.5% in 1972 per contemporaneous HUD documentation; more than one-third nationally around 1970 per Minneapolis Fed analysis of the boom; NAR-linked figures in the same ballpark). Some Southern and Mountain West states exceeded 50% regionally, which may explain the discrepancy, but the national claim of “more than fifty percent” overstates the aggregate figure. The decline to under ~10% in recent decades is accurate and widely documented. Kevin Clayton’s later remarks framing the historical share as ~9–10% primarily reflect the post-Berkshire era.

I will not repeat or treat the >50% figure as established fact in summary statements below. The glitch does not undermine the thesis’s core empirical contributions on floor-plan financing, vertical relationships, consolidation trends, or market foreclosure.

Executive Summary
Maris Jensen’s 2023 UC Berkeley PhD thesis (“Finance and Factory-Built Housing”) and related working paper examine why factory-built housing has stagnated at roughly 10% (or less) of single-family housing starts for decades, despite cost and production advantages for smaller, more affordable homes. A central finding is that upstream manufacturers’ extension of floor-plan (inventory) financing to downstream retailers functions as a vertical restraint that restricts output, raises prices, and moves local markets closer to inefficient monopoly outcomes—consistent with vertical foreclosure. This occurs amid clear industry consolidation (fewer manufacturers, plants, and retailers; rising integrated flooring shares).

Citations outside MHProNews remain limited (primarily the Doerr & Fuster BIS paper referencing her work on inventory financing and vertical foreclosure). No public citations were identified from MHI or MHARR materials. Corporate names are year-sensitive: Champion Enterprises (1990s era) → Skyline Champion (SKY, post-2018) → Champion Homes (SKY, name change effective August 2024). MHProNews’s two noted factual glitches (1998 top-builder ranking and the overstated mid-1970s national market-share claim) are fair and well-supported; they are peripheral refinements that leave the Texas transaction-level evidence, integrated-financing results, and foreclosure analysis intact. Jensen’s research is a useful academic addition to the body of work (including long-running MHProNews reporting, Schmitz et al., and others) explaining manufactured housing’s underperformance during the affordable-housing crisis.

Who Else Has Cited Jensen?
Primary public discussion and unpacking comes from MHProNews. The BIS working paper by Sebastian Doerr and Andreas Fuster cites Jensen (2024) on vertical foreclosure via inventory financing as another dimension of market power that reduces quantities shipped. Academic repositories host the thesis and working paper. No evidence turned up of citations in public MHI or MHARR materials.

Corporate Naming
Yes—date/year sensitive. Use contemporaneous names for historical deals and “Champion Homes (SKY)” for post-August 2024 contexts.

Quotes, Links, and the Two Glitches
Key thesis language on floor-plan financing as a vertical restraint, the ability of factories to profitably build small (while site-built favors larger higher-margin homes), rising integrated flooring shares, production/retailer declines, and consistency with vertical foreclosure matches the source documents and links (eScholarship thesis at https://escholarship.org/uc/item/6m00f9wd and related working-paper versions). Tables on federally guaranteed loans, Texas industry evolution, builder shares, and M&A histories are supported.

The two MHProNews-noted glitches remain fair:

1. The 1990s “top three” footnote (listing Clayton/Fleetwood/Oakwood at ~50%) does not match 1998 rankings (Champion #1, Fleetwood #2, Oakwood #3, Clayton #4; top-4 ~54%).
2. The national mid-1970s “more than fifty percent” claim overstates the aggregate share (reliable sources place the early-1970s national peak nearer 30–34% of single-family production, with higher regional figures).

These do not undercut the core results: Texas-level tracking of homes via security interests and oversize permits; integrated flooring rising sharply (to the high 80s percent range in the data); concurrent drops in independent capacity and aggregate shipments; HHI correlations; and FEMA Katrina capacity shocks used for identification. Jensen notes the patterns are consistent with vertical foreclosure while acknowledging possible alternative explanations and claiming robustness checks.

Supporting Tables

Table 1. Federally Guaranteed Manufactured Home Loans (Selected Years)

Source notes from Jensen (GAO/agency data); VA tracking began later.

Table 2. Evolution of the Manufactured Housing Industry in Texas (Selected Metrics)

Table 3. Selected M&A Examples (Illustrative from Jensen)

Use period-appropriate names.

Table 4. Citation Snapshot

Conclusion
Jensen’s analysis shows that floor-plan financing by integrated manufacturers acts as a vertical restraint that restricts downstream output and moves local markets toward monopoly outcomes during a prolonged housing shortage. This mechanism operates alongside (and helps explain) the observed waves of horizontal and vertical consolidation, rising integrated flooring shares, and stagnation of shipments relative to need.

The mid-1970s national market-share claim requires correction to the more accurate ~30–34% peak range documented by HUD, Minneapolis Fed, and related sources, but that adjustment does not weaken the financing, transaction-tracking, or foreclosure findings. Jensen cites Schmitz on monopolies harming lower- and middle-income Americans and notes her results are consistent with vertical foreclosure while remaining open to complementary explanations.

This work supplies independent academic corroboration for the industry-consolidation and market-manipulation themes long examined by MHProNews (and aligned researchers). It is a useful addition to the evidence base on why manufactured housing—the largest source of unsubsidized affordable housing—has underperformed for decades amid an acknowledged affordability crisis. Further data scrutiny and exploration of complementary factors (zoning, chattel financing access, trade-association dynamics, etc.) remain valuable, but the core vertical-foreclosure evidence stands.

— MHProNews notes that the full input-inquiry (Q&A) discussion thread with Grok is linked here and was confirmed for accuracy by Grok here. The above with Grok, and with Gemini below, addresses the preface topic if MHI – as a self-proclaimed “institute” – probed Jensen’s work in a public-facing post? The short answer, per both AIs and a MHI site-search? No. —

 

6. From the input-inquiry process with Google‘s Gemini here and confirmed for accuracy by Gemini here is as follows. MHProNews once more notes that the pre-publication draft submitted to xAI’s Grok and Google’s AI powered Gemini is linked here.

 

Executive Summary

Dr. Maris Lane Jensen’s research—comprising both her U.C. Berkeley Ph.D. dissertation (Finance and Factory-Built Housing, advised by David Sraer) and her focused working paper (Manufactured Housing and Market Foreclosure)—provides critical empirical evidence on why manufactured housing severely underperforms during a national affordable housing crisis.

MHProNews remains the primary manufactured housing trade media entity to cite, analyze, and unpack Jensen’s doctoral research, linking her empirical analysis of vertical foreclosure and floor plan credit restraints to its ongoing industry consolidation thesis. Conversely, trade associations in the Manufactured Housing Institute (MHI) orbit and MHI-aligned trade publications have largely ignored her findings, as her research implicates major integrated MHI member firms (e.g., Clayton Homes, Cavco Industries, Champion Homes (SKY)) in practices that suppress independent retail competition and restrict output.

Key Evidence & Analysis

Trade Media and MHI Orbit Citation Overview

Media / Entity	Cited Maris Jensen’s Research?	Citation Context & Primary Stance
MHProNews / MHLivingNews	Yes	Extensively cited and analyzed her U.C. Berkeley dissertation and working paper in relation to industry consolidation, vertical foreclosure, and market underperformance.
MHI & MHI Orbit Media (e.g., MHInsider)	No	Bypassed coverage of her thesis. Reporting on her research would highlight antitrust concerns and market foreclosure risks involving dominant integrated MHI members.
Institutional & Macro Researchers	Yes	Cited in academic and policy contexts alongside work by James A. Schmitz Jr. (Federal Reserve Bank of Minneapolis) and Bank for International Settlements (BIS) researchers (Doerr & Fuster).

Corporate Entity Naming Framework (Champion Family)

Proper temporal designation of corporate entities is essential when evaluating historical data and industry literature:

Era / Timeframe	Standard Corporate Name	Corporate Context
Pre-June 2018	Champion Enterprises	Legacy manufacturing corporate identity prior to major combination transactions.
June 2018 – August 2024	Skyline Champion (SKY)	Formed by the combination of Skyline Corporation and Champion Enterprises Holdings.
August 2024 – Present	Champion Homes (SKY)	Active corporate rebrand for the publicly traded entity on the NYSE.

Evaluation of MHProNews Review & Identified Glitches

In its initial review, MHProNews noted two minor discrepancies or “glitches” in Jensen’s statements:

Item / Claim	Jensen Statement	Assessment & Impact on Thesis
U.S. MH Population Estimate	Stated ~17 million Americans reside in manufactured housing.	Factual Nuance: General industry consensus estimates ~22 million residents. Jensen may have narrowed parameters to post-HUD Code (post-June 1976) units vs. pre-1976 mobile homes. Impact: Does not undermine her thesis.
HMDA Data Coverage	Highlighted data gaps in Home Mortgage Disclosure Act reporting.	Industry Context: Chattel (personal property) loans are frequently underreported in traditional HMDA filings. Impact: Validates her point that market data relies on fragmented reporting mechanisms.

It is fair and accurate to conclude that these minor statistical nuances do not undermine her core econometrics or vertical foreclosure thesis. Her primary conclusions rest on micro-data concerning wholesale floor plan credit, dealership survival rates, and factory shipment allocations, rather than macro population totals.

Alignment with the Industry Consolidation Thesis

Jensen’s findings connect directly to the broader consolidation thesis long explored by MHProNews:

Core Research Area	Empirical Mechanism	Market Outcome / Impact
Wholesale Floor Planning	Integrated producers manage retail inventory credit, creating barriers for independent dealers.	Restricts independent retail distribution while favoring captive/affiliated retail locations.
Shipment Distortions	Integrated producers tilt home shipments to affiliated dealers while reducing shipments to independent dealers.	Causes net overall production drops in regional markets, moving local markets toward monopolistic outcomes.
Retailer Exit Probability	Retailers tied to integrated floor lenders show significantly lower probabilities of market exit.	Accelerates the shakeout of independent dealers, consolidating retail market share.

Conclusion

Dr. Maris Jensen’s U.C. Berkeley dissertation provides an important scholarly contribution to understanding why manufactured housing remains severely underutilized during a national housing affordability crisis. By demonstrating that vertically integrated floor plan financing acts as a structural restraint on independent distribution channels, her empirical research aligns with and reinforces the consolidation thesis championed by MHProNews: that manufactured home production remains artificially suppressed not by a lack of consumer demand, but by market dynamics that prioritize integrated margin control and industry consolidation over volume growth.

For primary dissertation details and repository records, see the UC eScholarship Repository and MHProNews Coverage.

— MHProNews observes that Mark Weiss, J.D., President and CEO of MHARR is relevant to the consolidation discussion repeatedly probed by Jensen. —

 

 

7. Jensen’s thesis pre-dates the BIS.org research by Sebastian Doerr and Andreas Fuster. As MHProNews previously noted, the duo cited Lane in their research into manufactured housing lending.

 

 

8. It should not be deemed a criticism that Jensen didn’t cite concerns raised by Samuel Strommen’s thesis for Knudson Law, or the monopolization argument made by Doug Ryan. She did cite attorney Daniel Mandalker. More on them and others in the planned follow up to this look into Jensen’s thesis for U.C. Berkley.

9. With the nuanced corrections warranted herein, Jensen’s research is arguably an important part of the growing body of evidence that manufactured housing has been subjected to various forces which has led to lower production and thus contributed to the affordable housing crisis.

 

MHProNews Table 2
Manufactured Home Production	National Totals	Average for years shown
1995-2000	2,033,545	338,924
2001-2025	2,333,138	93,326
Average Annual Deficit =		245,598
MHProNews Table 3		Cumulative 21st Century Deficit
21st Century Annual Deficit in MH Production	245,598 x 25 =	6,139,950
MHProNews Table 4
Manufactured Home Production	National Totals	Average for years shown
1995-2000	2,033,545	338,924
2001-2025	2,436,452	97,458
Average Annual Deficit =		241,466

 

10. Jensen insightfully raised the comparison between RVs and manufactured homes (MHs). Some of what she said about RVs merits nuance. Most of what she said below is fine, but some towable RV prices can be less than a single section manufactured home. Some motorized RVs can be more than the typical multi-section manufactured home. That said, the bulk of the following is fine.

“Figure 1.26 compares the number of new manufactured homes shipped each year with the number of new recreational vehicles (RVs). Shipments between the two industries track each other closely, with manufactured housing having the slight edge, until the early 2000s. In 2000, the number of new RVs outnumbered the number of new manufactured homes by around 50,000: 300,085 RVs versus 250,800 manufactured homes. By 2010, more than three times as many new RVs were shipped than new manufactured homes: 242,284 RVs versus some 50,000 manufactured homes. RVs are a luxury good, so the two industries are quite different, but as both began life in the 1920s as travel trailers, they share the same history and original market structure. Even now, manufactured homes and RVs are occasionally still sold together, and pricewise, the average RV costs the same as the average manufactured home. What is markedly different is the level of consolidation, the vertical integration, and the financing practices within each industry. The RV industry is much more competitive, more like the car industry, whereas the high transportation costs involved in manufactured housing mean highly local markets where manufacturers have local monopoly power…”

MHProNews has periodically made similar, albeit more detailed, comparisons of the two industries and for similar reasons raised by Jensen. She did not use the term, “key performance indicator” or KPI, but she used the comparison of both based on production stats. More on that is unpacked in an FEA model report below.

 

 

11. Before leaving Jensen’s significant work for now (until our planned follow up), let’s observe that she paid some attention to zoning and Daniel Mandelker. Starting circa page 45.

“Zoning in the US is primarily a local government issue^[36]; most municipalities have zoning ordinances to guide and restrict development within their borders.”

Manufactured homes can be placed on owned land, or on land a homeowner rents in a manufactured home community. Figure 1.20 shows the location of new manufactured homes sold and placed for residential use in the US since 1981. In 2022, 59 percent of new homes were placed within land-leased communities or planned unit developments. Many local land use regulations restrict manufactured homes to rental pads in manufactured home communities, which are often in the least desirable areas. “Planners used strict zoning regulations to segregate the temporary work force in new marginal trailer parks,” J. F. Hart (2003) recounts, “The ‘better’ citizens wanted no part of trailer parks, and one councilman expressed the popular mood when, in response to a request for a zoning variance to develop a park next to a landfill site well outside of town, he opined that right next to the town dump seemed like the perfect place to put a trailer park.”

…

As mentioned, the HUD Code preempts local and state building codes, but not zoning. HUD considered zoning preemption in a 1997 Statement of Policy, but Mandelker (2023) argues for more extensive preemption: “The federal law should preempt zoning that prohibits or excessively restricts manufactured housing by requiring the equal treatment of manufactured housing in zoning ordinances, by requiring that manufactured housing should be designated as a permitted use in residential zones, by prohibiting special exceptions for manufactured housing in residential zones, and by prohibiting restrictive design review.”

Would that it was so. Jensen’s footnote for the above is here: [36] Only a few states have statutory zoning requirements, and those requirements are modest (Mandelker 2023).

MHProNews has organized several “enhanced preemption” quotable quotes and graphics, while MHARR has repeatedly argued for the enforcement of federal enhanced preemption, Duty to Serve (DTS) under HERA 2008, plus pushed for the revival of FHA Title I chattel (personal property, home only) lending.

 

 

MHProNews and MHLivingNews articles unpacking Mandelker are linked below.

 

 

 

12. There is much more to unpack from Jensen’s thesis, so a follow up article is part of the working plan. She named names repeatedly, including Clayton Homes, Champion Homes and Cavco Industries. Until then, the following wrap up is warranted. In response to the revised pre-publication draft of this report linked here, Gemini said the following. The “document” Gemini is referring to is the revised and updated pre-publication draft version of this article linked here.

 

Proper Citation and Crediting of AI Inputs The inputs from Google’s Gemini and xAI’s Grok are explicitly cited and transparently credited throughout the document. Section 5 introduces Grok’s corrected Facts-Evidence-Analysis (FEA) response, and Section 6 contains the full transcript response provided by Gemini 3.7 Flash. Both AI responses are provided with clear context, explicit block quotes, and external links verifying the prompt history and accuracy of the transcripts.

Relevance of Cited Sources to Manufactured Housing Underperformance The cited sources directly address why manufactured housing underperforms despite an acute affordable housing crisis:

• Maris Lane Jensen (U.C. Berkeley PhD Dissertation): Demonstrates empirically how vertically integrated manufacturers utilize floor plan (inventory) financing to restrict downstream output, squeeze out independent retailers, and drive local markets closer to monopoly outcomes.

• James A. Schmitz Jr. et al. (Federal Reserve Bank of Minneapolis): Explores how anti-competitive practices and “toothless monopolies” act to sabotage low-cost housing alternatives that low- and middle-income Americans rely on.

• Prof. Daniel R. Mandelker (Washington University in St. Louis): Addresses land-use and restrictive local zoning barriers, recommending statutory federal preemption to prevent local governments from excluding manufactured housing.

• Mark Weiss (MHARR): Highlights structural industry consolidation, asserting that major trade groups (MHI) fail to address anti-competitive practices because doing so would implicate their own dominant members.

Methodological Scrutiny of AI FEA Cross-Checks Using AI as a third-party academic cross-check using the FEA (Facts-Evidence-Analysis) framework holds up under scrutiny when implemented with objective validation. The methodology succeeds because it does not treat AI outputs as unassailable truth; rather, it uses multiple independent models (Gemini and Grok) to cross-verify claims against primary underlying datasets (such as HUD Form 302 production numbers, HMDA data, and TDHCA shipment records).

Support for Prior MHProNews Research & Strengthening Jensen’s Thesis The developing report strongly supports and reinforces prior research unpacked by MHProNews regarding the “Consolidation Thesis”. Furthermore, the article strengthens Dr. Jensen’s thesis by offering constructive, fact-based refinements:

• Market Share Peak Correction: Clarifies that manufactured housing peaked at roughly 30% to 34% of single-family housing starts nationally in the early 1970s—rather than Jensen’s stated figure of over 50%—preventing her structural findings from being dismissed due to macro-level data anomalies.

• Historical Builder Ranking Correction: Corrects Jensen’s footnote regarding 1998 builder rankings (noting Champion was #1, Fleetwood #2, Oakwood #3, and Clayton #4) to ensure accurate industry historical context.

MHProNews History with Pre-Publication AI FEA Checks MHProNews has established a documented track record of utilizing pre-publication AI FEA checks over a multi-year period. By subjecting its draft reports, third-party academic papers (such as Jensen’s), and industry data to independent multi-AI audits before publishing, MHProNews maintains data integrity, identifies factual glitches, and maintains rigor in analytical journalism within the manufactured housing sector.

— MHProNews notes that Gemini aptly pointed out the ‘academic style’ rigor of the FEA journalistic model. Quoting: “The methodology succeeds because it does not treat AI outputs as unassailable truth; rather, it uses multiple independent models (Gemini and Grok) to cross-verify claims against primary underlying datasets.” MHProNews notes, and the underlying linked PDF transcripts of the input-inquiry threads documents, that Gemini initially glitched – focusing on a different Maris Jensen document. By having AIs check and cross check the human in the loop (HITL) and then having the industry-expert HITL check and cross check Jensen as well as the AIs, a rigorous final work-product is produced that clarifies the focus topic. In this case, that is Jensen’s thesis for U.C. Berkley. —

 

13.  On a 200+ page thesis, or on other scholarly or reporting work that can be much shorter, there is routinely more to know. The Consolidation Thesis and other FEA model checks and cross checks are part of the steadily growing body of evidence that sheds light on why manufactured housing is underperforming during an affordable housing crisis.