In the next chapter, "Indivisible Labor with Endogenous Hours: Micro and Macro Labor Supply Elasticities," I study a long-standing discrepancy regarding the magnitude of the Frisch (intertemporal) labor supply elasticity. Empirical studies using individual level data typically uncover an estimated Frisch elasticity below 0.5. By contrast, in the quantitative macroeconomics literature on business cycles, the Frisch elasticity of the representative household (the macro labor supply elasticity) inferred from aggregate time series is often much larger, typically exceeding 2. I explore the quantitative relationship between the individual-level Frisch elasticity along the intensive hours-of-work margin and the macro-level Frisch elasticity in an equilibrium business cycle model. I extend the pure indivisible labor model of Rogerson (1988) and Hansen (1985), allowing firms to choose hours as well as employment. Although a firm would optimally select a fixed workweek given a nonlinear mapping from hours worked to labor services, it has an incentive to adjust both hours (the intensive margin) and employment (the extensive margin) over the business cycle when confronted with employment adjustment costs. A notable feature of the performance of my model is its ability to reproduce both the volatility and persistence of aggregate hours along the intensive margin while retaining the success of the pure indivisible labor models in terms of the large volatility of total hours. My quantitative analysis reveals that the macro labor supply elasticity is approximately twice as large as the individual labor supply elasticity, and thus accounts for a significant portion of the discrepancy between micro- versus macro- based measures of the elasticity of labor supply.