One of the factors in the financial crisis of 2007-2009 that is mentioned too infrequently is the role of banking capital sufficiency standards and exactly how they were written. Folks have said that capital requirements were somehow deregulated or reduced. But in fact the intention had been to tighten them with the Basle II standards and US equivalents. The problem was not some notional deregulation, but in exactly how the regulation was written.
In effect, capital sufficiency standards declared that mortgage-backed securities and government bonds were “risk-free” in the sense that they were counted 100% of their book value in assessing capital sufficiency. Most other sorts of financial instruments and assets had to be discounted in making these calculations. This created a land rush by banks for mortgage-backed securities, since they tended to have better returns than government bonds and still counted as 100% safe.
Without the regulation, one might imagine banks to have a risk-reward tradeoff in a portfolio of more and less risky assets. But the capital standards created a new decision rule: find the highest returning assets that could still count for 100%. They also helped create what in biology we might call a mono-culture. One might expect banks to have varied investment choices and favorites, such that a problem in one class of asset would affect some but not all banks. Regulations helped create a mono-culture where all banks had essentially the same portfolio stuffed with the same one or two types of assets. When just one class of asset sank, the whole industry went into the tank,
Well, we found out that mortgage-backed securities were not in fact risk-free, and many banks and other financial institutions found they had a huge hole blown in their capital.
Warren Meyer, “When Regulation Makes Things Worse — Banking Edition”, Coyote Blog, 2014-07-07.
May 13, 2015
QotD: Mono-culture banking
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