Book review of Fault Lines by Raghuram G. Rajan

Most people believe that the recent financial crisis had its roots in a boom in housing lending in the United States. After the dot-com bubble, the argument goes, the Federal Reserve Bank lowered the interest rates to stimulate corporate investment and recover from the downturn. As a side effect of low interest rates, mortgages became cheaper and Americans became attracted to the housing market. Credit for housing was provided by the sophisticated financial system of the United States, which allowed investors to purchase packages of mortgages from diversified geographical locations, and from individuals with different probabilities of default, according to their desired level of risk. As it turned out, these products caught the attention of investors from all over the world, who were attracted by their profitable returns and the implicit guarantees provided by the U.S. government to the issuing agencies and financial intermediaries. Therefore, housing credit was plentiful and, as a consequence, house prices in the United States rose. This in turn allowed mortgage borrowers to refinance their debts and avoid default. The party came to an end when interest rates increased and house prices fell, triggering a series of defaults in mortgages and driving values of the financial products near to zero, resulting in consequences with which we all are too familiar.