Interbank funding markets seized up, the shadow banking system crumpled and several major financial firms – banks and nonbanks alike – collapsed or approached the brink of collapse. Extraordinary interventions of governments and central banks around the world were necessary to prevent a complete collapse of the financial system and the broader economy. As a general matter, regulators did not appreciate beforehand how vulnerable the system was to shocks. In particular, there was a failure to appreciate the important interconnections among the banking system, capital markets, and payment and settlement system. For example, the disruption of the securitization markets caused by the poor performance of highly rated debt securities led to significant problems for major financial institutions. These banks had to take assets back on their books, backstop lines of credit were triggered, and banks could no longer securitize loans, thus increasing the pressure on their balance sheets. This reduced credit availability, which increased the downward pressure on economic activity, which caused asset values to decline further, and in turn, increased the degree of stress in the financial system. Moreover, regulators did not adequately understand how the dynamics of the system tended to exacerbate shocks, rather than dampen their impact. For example, with respect to capital, firms under stress had incentives to continue to pay dividends to show that they were strong. These dividend payments actually depleted capital, making the firms weaker and vulnerable to credit rating downgrades. When credit ratings were indeed cut, that increased collateral calls, which intensified the pressure on scarce liquidity resources.
*  *  *  BIS Review 9/1999