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Existing models of structural change typically assume that all of investment is produced in manufacturing. This assumption is strongly counterfactual: in the postwar US, the share of services value added in investment expenditure has been steadily growing and it now exceeds 0.5. We build a new model, which takes a unified approach to structural change in investment and consumption. Our unified approach leads to three new insights: technological change is endogenously investment specific; having constant TFP growth in all sectors is inconsistent with structural change and aggregate balanced growth occurring jointly; the sector with the slowest TFP growth absorbs all resources asymptotically. We also provide empirical support from the postwar US for the first and third insight.

Zonder onderwerpscode: economie

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Using the Consumption Activities Mail Survey (CAMS) module in the HRS we document how time allocations change for individuals within a household when one or more members transitions from full time work to not working. Our basic finding is that the ratio of home production to leisure time is approximately constant for both family members. We then build a model of household labor supply to understand the implications of this finding for preferences and the home production function. We conclude that this fact suggests a relatively large elasticity of substitution between the leisure of the two members. For commonly used preference specifications, this also implies a large (i.e., greater than one) intertemporal elasticity of substitution for leisure.

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We study business cycle fluctuations in heterogeneous-agent general equilibrium models that feature both intensive and extensive margins of labor supply. A nonconvexity in the mapping between time devoted to work and labor services combined with idiosyncratic shocks generates operative extensive and intensive margins. We consider calibrated versions of this model that differ in the value of a key preference parameter for labor supply and the extent of heterogeneity. The model is able to capture the salient features of the empirical distribution of hours worked, including how individuals transit within this distribution. We then study how the various specifications influence labor supply responses to aggregate technology shocks. We ask to what extent our predictions for business cycle fluctuations are affected by abstracting from the intensive margin and instead assuming that adjustment occurs only along the extensive margin. We find that abstracting from intensive margin adjustment can have large effects on the volatility of aggregate hours even if fluctuations along the intensive margin are small.