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We build a heterogeneous agents life cycle model that captures a large number of salient features of individual male labour supply over the life cycle, by education, both along the intensive and extensive margins. The model provides an aggregation theory of individual labour supply, firmly grounded on individual-level micro-evidence, and is used to study the aggregate labour supply responses to changes in the economic environment. We find that the aggregate labour supply elasticity to a transitory wage shock is 1.75, with the extensive margin accounting for 62% of the response. Furthermore, we find that the aggregate labour supply elasticity to a permanent-compensated wage change is 0.44.

Goldin (2014) offers a narrative in which gender differences in home production responsibilities create gender gaps in labor market outcomes. We carry out a model-based quantitative assessment of this narrative and find that it can account for a significant share of gender gaps in occupational choice, wages, and hours. Our analysis emphasizes the quantitative significance of two key elements not highlighted by Goldin: heterogeneity in comparative advantage and multimember households. Gender differences in nonmarket responsibilities have important aggregate effects on welfare and productivity, similar to those emphasized by Hsieh et al. (2019).

\"We build a model of heterogeneous individuals - who make investments in schooling quantity and quality - to quantify the importance of differences in human capital vs. total factor productivity (TFP) in explaining the variation in per capita income across countries. The production of human capital requires expenditures and time inputs; the relative importance of these inputs determines the predictions of the theory for inequality both within and across countries. We discipline our quantitative assessment with a calibration firmly grounded on US micro evidence. Since in our calibrated model economy human capital production requires a significant amount of expenditures, TFP changes affect disproportionately the benefits and costs of human capital accumulation. Our main finding is that human capital accumulation strongly amplifies TFP differences across countries: to explain a 20-fold difference in the output per worker, the model requires a 5-fold difference in the TFP of the tradable sector, vs. an 18-fold difference if human capital is fixed across countries.\" Die Untersuchung enthält quantitative Daten. Forschungsmethode: Theoriebildung; Grundlagenforschung; empirisch-quantitativ; empirisch. Die Untersuchung bezieht sich auf den Zeitraum 1990 bis 1996. (author's abstract, IAB-Doku).

We develop a theory of capital-market imperfections to study how the ability to enforce contracts affects resource allocation across entrepreneurs of different productivities, and across industries with different needs for external financing. The theory implies that countries with a poor ability to enforce contracts are characterized by the use of inefficient technologies, low aggregate TFP, large differences in labor productivity across industries, and large employment shares in industries with low productivity. These implications are supported by the empirical evidence. The theory also suggests that entrepreneurs have a vested interest in maintaining a status quo with low enforcement.

In this paper, we develop a model of money and reserve‐holding banks. We allow for private liabilities to circulate as media of exchange in a random‐matching framework. Some individuals, which we identify as banks, are endowed with a technology to issue private notes and to keep reserves with a clearinghouse. Bank liabilities are redeemed according to a stochastic process that depends on the endogenous trades. We find conditions under which note redemptions act as a force that is sufficient to stabilize note issue by the banking sector.

We build on our earlier model of money in which bank liabilities circulate as a medium of exchange. We investigate optimal bank behavior and the resulting provision of liquidity under a range of central bank regulations. In our model, banks issue inside money under fractional reserves, facing the possibility of excess redemptions. Banks consider the float resulting from money creation and make reserve-management decisions that affect aggregate liquidity conditions. Numerical examples demonstrate positive bank failure rates when returns to banking are low. Central bank interventions may improve banks' returns and welfare through a reduction in bank failure.

We present a theory concerning the realization of capital gains where ownership and control are linked as in Holmes and Schmitz (J. Pol. Econ. 103: 1005–1038, 1995). The model developed is a version of a Lucas-tree economy in which the productivity of a technology depends on the ownership of the technology. The existence and uniqueness of equilibrium follow from the Contraction Mapping Theorem. The theory implies that impediments to asset trading, such as capital gains taxation, negatively affect production efficiency. Moreover, we calibrate the model economy to U.S. data on small-business turnover and find that indexing deductions for inflation is capable of increasing capital-gains tax revenues.

The Hopenhayn and Rogerson (1993) framework is extended to understand how different forms of taxing capital income affect firms’ investment and financial policies over their life cycle. Corporate income taxation slows down firm growth over the life cycle by reducing after-tax profits available for reinvesting, and it distorts optimal firms’ size. Dividend income taxation reduces external equity financing, but it does not affect size at maturity. Capital gains taxes make firms start larger, so that internal growth is lower. With these mechanisms in mind, we calibrate our economy to the US and discuss different revenue-neutral tax reforms that might lead to increases in aggregate output and capital.

We build on our earlier model of money in which bank liabilities circulate as a medium of exchange. We investigate optimal bank behavior and the resulting provision of liquidity under a range of central bank regulations. In our model, banks issue inside money under fractional reserves, facing the possibility of excess redemptions. Banks consider the float resulting from money creation and make reserve-management decisions that affect aggregate liquidity conditions. Numerical examples demonstrate positive bank failure rates when returns to banking are low. Central bank interventions may improve banks' returns and welfare through a reduction in bank failure. [PUBLICATION ABSTRACT]

What are the aggregate effects of informality in a financially constrained economy? We develop and calibrate an entrepreneurship model to data on matched employer-employee from both formal and informal sectors in Brazil. The model distinguishes between informality on the business side (extensive margin) and the informal hiring by formal firms (intensive margin). We find that when informality is eliminated along both margins, aggregate output increases 9.3%, capital 14.7%, TFP 5.4%, and tax revenue37%. The output and TFP increases would be much larger if informality were only eliminated on the extensive margin, a result that supports the view that the informal economy can play a positive role in an economy with financial frictions. Finally, we find that the output cost of financing social security in our baseline model is about twice as large as the one in an economy with no frictions.