While there is a consensus among researchers and policy makers that the 2008–2009 crisis was triggered by financial market disruptions in the United States, there is little agreement on whether the transmission of the crisis and the subsequent prolonged recession were caused by credit factors or a collapse of demand for goods and services. On the one hand, a credit crunch, defined as a reduction in the ability of firms to get loans or a sudden tightening of the conditions required to obtain a bank loan, squeezes firms’ working capital and hurts their production. On the other hand, adverse demand shocks to firms come from declines in demand for firms’ products and services. Each type of factor has fundamentally different policy implications. If credit factors are found to play the main role, the solution would be to provide more and cheaper credit. But if demand factors are the main drivers, the focus should be on boosting investors’ and consumers’ confidence. Interestingly, most of the effort to understand the impact of the crisis focuses on credit and not on demand.