Welcome to The S-Curve
Now you will be able to receive the latest announcements, product updates, and our insights on the mortgage market in real time.
The name of the blog, the S-Curve, is a reflection of our logo and the central feature of our prepayment model. S-curves are seen in nature in many phenomenon, from population growth to prepayment and default models. Our first S-curve, in the early 1990s, used the arctangent function, then piece-wise linear functions, and evolved over time to be more complex and vary by FICO, loan size and LTV. This evolution encapsulates both the timeless nature of fundamental relationships and constant innovation to describe them better over time.
We hope you find the information useful and we look forward to your feedback.
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Mortgages at SFVegas 2023EventsThe Structured Finance Association hosted SFVegas 2023 (February 26 - March 1), a broad capital markets conference with thousands of attendees in Las Vegas. Andrew Davidson & Co. Inc. (AD&Co) was a sponsor focused on the mortgage sector. As we engaged with clients and policy leaders, a few themes emerged: Data, Expanding Access Safely, Ginnie Mae Servicing and Auto Loan Performance.
Data
Well-managed data is the underpinning of well-run mortgage organizations, supporting efforts to manage risk, profitability, and compliance. Data is essential to developing new products, improving accuracy, and expanding access to mortgage finance. Nearly everyone we spoke to spends time and money on data and still struggles to manage it through their internal operations, from loan level acquisition to portfolio management and reporting. They expend additional effort to acquire and pass on data in the larger mortgage ecosystem. The richness and reliability of data degrade even within companies, let alone as mortgage-related assets pass through the value chain. This degradation worsens the information asymmetry between sellers and buyers, increasing risk and pushing the mortgage business further from an efficient market. It impedes adding new data to the data-frame, such as the new Trended Credit Scores or expanded data generally, that helps expand markets.
These realities align with the economic theory of imperfect markets and utilities. Markets that provide gains from scale and consistency have attributes of public utilities. Adding privacy concerns and positive systemic value beyond individual mortgage transactions do as well. Reducing the inherent information asymmetry between sellers and buyers further suggests that the efficient market outcome could be a regulated market utility of loans and related data. Data aggregators can supply to the utility, and data consumers can access it.
Expanding Access Safely
Safely expanding access to mortgage finance is not automatic. The legacy of discrimination generally and in housing finance specifically, shows up in the persistently lower homeownership rates of minority populations. Homeownership rates can be expanded temporarily by lowering standards and raising risk, or durably by using new data that lowers risk. Making progress requires commitment and solving the data market failure described above.
Ginnie Mae Servicing
It’s well known that compliantly servicing non-performing loans can cost several times the fixed servicing fee and thus pose systemic risk. During the Pandemic, Federal agencies scrambled to provide financing and reduce the burden on non-bank servicers that represent a substantial majority of the Ginnie Mae market without the federal backing that most of the mortgage ecosystem enjoys. This cost-revenue imbalance is not an advancing issue and cannot be solved by transferring the burden of advancing NPL payments to bond holders. The market bid for Ginnie Mae servicing in mid-2020 was zero because of the expectation of high NPL rates. Fortunately, record low mortgage rates and record refinancing volume provided servicers who were also originators with cash flow to offset the cost of servicing FHA NPL rates that temporarily reached 14%. The next time there is a systemic rise in delinquency rates, this extra cash flow is unlikely.
What’s the solution for this? The most straightforward solution is a variable servicing fee that aligns revenues with expenses, but there is surprisingly little enthusiasm for this solution. Ginnie Mae’s leadership is clearly aware of the systemic risk potential and is seeking a solution. The U.S. mortgage market often uses a federal backstop behind private financial markets to provide the stability the economy depends on. The backstops of deposit insurance or for the GSEs are examples. We will be studying this issue.
Auto Loan Performance
For the first time in awhile, attention is being paid to rising auto loan delinquency rates, both prime and subprime. Ordinarily, today’s historically low unemployment rate would associate with low delinquencies, so this rise is worrisome. It’s well-known that supply-chain disruptions during the Pandemic caused spikes in new and especially used car prices. Cars financed at those high prices pose more risk, and used car prices have already dropped about 15% from their peak. AD&Co will be monitoring this performance and refining our models.
The S-Curve Archives
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EventsAndrew Davidson & Co., Inc (AD&Co) proudly sponsored IMN’s 11th Annual Mortgage Servicing Rights (MSR) Forum by Informa at the New York Hilton Midtown. Senior modeler Daniel Swanson joined the “Managing Delinquencies & Forbearance Value” panel in discussing how servicers are adapting to today’s market and the evolving delinquency trends.
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PodcastTune in to our fourth episode of AD&Conversations with Kevin Lin and Eknath Belbase, our product lead for our Climate model. In this episode, they discuss the new Climate Impact Suite (CIS) pilot project, and Belbase outlines several challenges the team is navigating, including:
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PodcastTune in to our fourth episode of AD&Conversations with Kevin Lin and Eknath Belbase, our product lead for our Climate model. In this episode, they discuss the new Climate Impact Suite (CIS) pilot project, and Belbase outlines several challenges the team is navigating, including:
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Podcast
Andrew Davidson was invited to speak on Equifax's Market Pulse Podcast titled, "Driving Efficiency and Resilience in the Mortgage Industry" live at the 2025 MBA Annual Convention in Las Vegas.
Andy explains how variations in data files can distort risk assessment, creating a dual risk for lenders: extending credit to borrowers more likely to default while overcharging customers whose risk is overstated.
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ThoughtsOur latest Policy Perspective written by Richard Cooperstein offers an analysis of the U.S. housing and mortgage finance markets, focusing on key trends and forward-looking risks. While housing markets are not fully efficient, they do respond to economic imbalances which create opportunities and vulnerabilities. This article explores how demographic shifts, credit access, interest rates, and climate risks shape both housing demand and supply.
Key findings include:
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PodcastJoin Kevin Lin in a conversation with Richard Cooperstein as they dive into Kinetics, AD&Co's modular platform designed to deliver the full power of our models and analytics; with the flexibility to license only the tools you need.
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ThoughtsThe latest Policy Perspectives paper “Competing Claims in Privatization of Fannie Mae and Freddie Mac” is now available!
Nearly 20 years ago, on September 6, 2008, the GSEs, Fannie Mae and Freddie Mac entered conservatorship. Since that time there have been many proposals to restructure, eliminate or release the GSEs. Once again there is talk about the privatization of Fannie Mae and Freddie Mac.
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ThoughtsAD&Co held our annual employee meeting in Detroit, Michigan. In addition to gathering everyone in person to socialize and strategize, we use these annual meetings to learn about different cities, especially with regard to housing market dynamics.
We chose Detroit because the oft-maligned city is undergoing a significant renaissance, and we wanted to explore the area and learn how housing may have played a role in both Detroit’s decline and rebirth.
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ProductsAndrew Davidson & Co., Inc (AD&Co) is pleased to announce the beta release of MARS+, the next generation of Mortgage Analysis & Reporting System (MARS), which has been in use since 2008 for performance reporting of AD&Co models. MARS+ aims to provide enhanced and advanced capabilities and features for mortgage analysis and reporting.
The new enhancements of MARS+ include:
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EventsSeveral AD&Co employees attended SFVegas 2025. This post shares their unique perspectives from attending the conference and key takeaways from the sessions.