It’s not news to observe that things that change at the GSEs then change a lot of other things.  Still, the scope of the GSEs’ influence across financial markets is startling as measured by a new Federal Reserve Bank of Philadelphia study of the spillover effect of the 2020 revisions to the PSPA.  The paper looks specifically at PSPA provisions restricting GSE purchase of what the paper calls speculative mortgages (i.e., seconds and investment properties).  Push here for GSE spec loans, pull there is observed for spec loans in the private sector, all other conforming loans, jumbos, and – surprisingly – bank small-business loans.

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