Empirical evidence suggests …nancial intermediaries increase risky investments when interest rates are low. We develop a model consistent with this observation and ask whether the risks undertaken exceed the social optimum. Interest rate policy a¤ects risk taking in the model through two opposing channels. First, low policy rates make riskier assets more attractive than safe bonds. Second, low policy rates reduce the amount of safe bonds available for collateralized borrowing in interbank markets. The calibrated model features excessive risk taking at the optimal policy. However, at low policy rates, collateral constraints tighten and risk taking doesn't exceed the social optimum.

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This paper analyses the Canadian economy for the post 1960 period. It uses an accounting procedure developed in Chari, Kehoe, and McGrattan (2006). The procedure identifies accounting factors that help align the predictions of the neoclassical growth model with macroeconomic variables observed in the data. The paper finds that total factor productivity and the consumption-leisure trade-off-the productivity and labor factors-are key to understanding the changes in output, labor supply and labor productivity observed in the Canadian economy. The paper performs a decomposition of the labor factor for Canada and the United States. It finds that the decline in the gender wage gap is a major driving force of the decrease in the labor market distortions. Moreover, the milder reduction in the labor market distortions observed in Canada, compared to the US, is due to a relative increase in effective labor taxes in Canada.

We develop a model in which a financial intermediary's investment in risky assets-risk taking-is excessive due to limited liability and deposit insurance, and characterize the policies that implement efficient risk taking. In the calibrated model, combining interest rate policy with state-contingent macroprudential regulations-either capital or leverage regulation, and a tax on profits-achieves efficiency. Interest rate policy mitigates excessive risk taking by altering the return and the supply of collateralizable safe assets. In contrast to commonly used capital regulation, leverage regulation has stronger effects on risk taking and calls for higher interest rates. (JEL E44, E52, G11, G18) * We thank Klaus Adam, V.

From 1980 until 2007, U.S. average hours worked increased by thirteen percent, due to a large increase in female hours. At the same time, the U.S. labor wedge, measured as the discrepancy between a representative household's marginal rate of substitution between consumption and leisure and the marginal product of labor, declined substantially. We examine these trends in a model with heterogeneous households: married couples, single males and single females. Our quantitative analysis shows that the shrinking gender wage gaps and increasing labor income taxes observed in U.S. data are key determinants of hours and the labor wedge. Changes in our model's labor wedge are driven by distortionary taxes and non-distortionary factors, such as cross-sectional differences in households' labor supply and productivity. We conclude that the labor wedge measured from a representative household model partly reflects imperfect household aggregation.