Why Did U.S. Banks Invest In Highly-rated Securitization Tranches?
The authors estimate holdings of highly-rated tranches of mortgage securitizations of American deposit-taking banks ahead of the credit crisis and evaluate hypotheses that have been advanced to explain these holdings. They find that holdings of highly-rated tranches were economically trivial for the typical bank, but banks with greater holdings performed more poorly during the crisis. Though univariate comparisons show that banks with large trading books had greater holdings, the holdings of highly-rated tranches are not higher for banks with large trading books in regressions that control for bank size. The ratio of highly-rated tranches holdings to assets increases with bank assets, but not for banks with more than $50 billion of assets.