House flippers triggered the US housing market crash, not poor subprime borrowers

https://qz.com/1064061/house-flippers-triggered-the-us-housing-market-crash-not-poor-subprime-borrowers-a-new-study-shows/

Gwynn Guilford
August 29, 2017

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Mounting evidence suggests that the notion that the 2007 crash happened because people with shoddy credit borrowed to buy houses they couldn’t afford is just plain wrong. The latest comes in a new NBER working paper arguing that it was wealthy or middle-class house-flipping speculators who blew up the bubble to cataclysmic proportions, and then wrecked local housing markets when they defaulted en masse.

Analyzing a huge dataset of anonymous credit scores from Equifax, a credit reporting bureau, the economists—Stefania Albanesi of the University of Pittsburgh, the University of Geneva’s Giacomo De Giorgi, and Jaromir Nosal of Boston College—found that the biggest growth of mortgage debt during the housing boom came from those with credit scores in the middle and top of the credit score distribution—and that these borrowers accounted for a disproportionate share of defaults.

As for those with low credit scores—the “subprime” borrowers who supposedly caused the crisis—their borrowing stayed virtually constant throughout the boom. And while it’s true that these types of borrowers usually default at relatively higher rates, they didn’t after the 2007 housing collapse. The lowest quartile in the credit score distribution accounted for 70% of foreclosures during the boom years, falling to just 35% during the crisis.

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The mortgages these prime borrowers were able to secure were much bigger than those taken out by poor homebuyers. Worse, speculators have less incentive to hold onto their extra homes than those who only own one home. So when the housing market started tumbling and the economy soon followed, they were much more willing to default and foreclose, as you can see in the chart below.

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This would explain why, as the researchers put it, “the rise in mortgage delinquencies is virtually exclusively accounted for by real estate investors.” The share of single-mortgage borrowers who couldn’t keep up on their loan payments barely budged between 2005 and 2008.

Recent research—particularly that by Antoinette Schoar, a finance professor at MIT Sloan—has been helping rewrite the received wisdom of the “subprime crisis” that has blamed the crisis on poor, reckless borrowers for the better part of a decade. Schoar’s work reveals that borrowing and defaults had risen proportionally across income levels and credit score, but that those with sounder credit ratings drove the rise in delinquencies. This new paper’s investigation into the habits of middle- and upper-income real estate speculators in the run-up to the crisis marks yet another chapter of the history books in desperate need of revision.