Agency mortgage-backed securities (MBS) issued by Fannie Mae and Freddie Mac have historically traded in separate forward markets. We study the consequences of this fragmentation, showing that market liquidity endogenously concentrated in Fannie Mae MBS, leading to higher issuance and trading...

Agency mortgage backed securities (MBS) with diverse characteristics are traded in parallel with individualized contracts in the specified pool (SP) market and with standardized contracts in the to-be-announced (TBA) market. We find that this unique parallel trading environment significantly...

We examine the economic mechanisms that limited arbitrage between the cash and forward markets of agency MBS, and whether asset purchases of the Federal Reserve (Fed) alleviated price dislocations. We find that the cash-forward basis, or the price difference between the cash and forward markets...

In March 2020, massive customer selling of U.S. Treasury securities and agency mortgage-backed securities (MBS) triggered by the COVID-19 pandemic overwhelmed dealers' capacity to intermediate trades, contributing to a marked deterioration of market functioning. The Federal Reserve promptly took...

This paper reviews the mortgage-backed securities (MBS) market, with a particular emphasis on agency residential MBS in the United States. We discuss the institutional environment, security design, MBS risks and asset pricing, and the economic effects of mortgage securitization. We also assemble...

We study how intermediaries-mortgage servicers-shaped the implementation of mortgage forbearance during the COVID-19 pandemic and use servicer-level variation to trace out the causal effect of forbearance on borrowers. Forbearance provision varied widely across servicers. Small servicers and...