Measured as yield spreads against AAA corporate bonds, the convenience premium for agency MBS averaged 47 basis points between 1995 and 2021, about half of the long-term-Treasury convenience premium. Both the MBS convenience premium and the issuance amount vary negatively with the mortgage rate,...

I develop an omnibus specification test for diffusion models based on the infinitesimal operator. The infinitesimal operator based identification of the diffusion process is equivalent to a "martingale hypothesis" for the processes obtained by a transformation of the original diffusion model. My...

An expansion in mortgage credit to subprime borrowers is widely believed to have been a principal driver of the 2002-06 U.S. house price boom. Contrary to this belief, we show that the house price and subprime booms occurred in different places. Counties with the largest home price appreciation...

The popular quantile regression estimator of Koenker and Bassett (1978) is biased if there is an additive error term. Approaching this problem as an errors-in-variables problem where the dependent variable suffers from classical measurement error, we present a sieve maximum-likelihood approach...

Many mortgage reform proposals suggest replacing Fannie Mae and Freddie Mac (the GSEs) with private entities. A common assumption underlying these proposals is that unlike the GSEs, private insurers will properly manage risk and set fair prices. Inconsistent with this assumption, this paper...

We study the impact of the refinancing channel of monetary policy on very small and medium sized businesses. Using data that cover the near universe of these businesses, increased household refinancing reduces the probability that a business exits or exhausts its debt capacity in the calendar...

The popular quantile regression estimator of Koenker and Bassett (1978) is biased if there is an additive error term. Approaching this problem as an errors-in-variables problem where the dependent variable suffers from classical measurement error, we present a sieve maximum-likelihood approach...

An expansion in mortgage credit to subprime borrowers is widely believed to have been a principal driver of the 2002–2006 U.S. house price boom. By contrast, this paper documents a robust, negative correlation between the growth in the share of purchase mortgages to subprime borrowers and...