Review of Economic Dynamics最新文献

I study how enforcement frictions in health insurance contracts determine the distribution of preventive care. I show that when contracts are weakly enforced, insurers underinvest in preventive care to perpetuate the need for insurance. This mechanism is self-enforcing, whereby low levels of prevention today breed low levels of prevention in the future. In contrast, I show that dynamic contracts that are perfectly enforced do not feature such history dependence. Leveraging these results, I devise a test to show that the hypothesis of limited commitment cannot be rejected in the data.

We study the consequences of market uncertainty on international trade. An increase in foreign market uncertainty dampens China's aggregate exports on both the extensive and intensive margins. The adverse effects are more pronounced in industries facing tighter financial constraints than in others. We propose a dynamic trade model to explain the facts. Greater uncertainty depresses a firm's expected value of exporting and borrowing capacity, leading to fewer exporters and smaller average size of exports. Under calibrated parameters, the uncertainty shock accounts for a sizable fraction of China's trade collapse in the 2008 financial crisis.

Financial crises have severe short and long-term consequences. We develop a general equilibrium model with financial frictions and endogenous growth in which macro-prudential policy supports economic activity and productivity growth by strengthening the resilience of financial intermediaries to adverse shocks. The improved intermediation capacity of a safer financial system leads to a higher steady-state growth rate. The optimal capital ratio increases welfare by 8%, one order of magnitude more than in the case without endogenous growth.

We present novel policy tools to manage epidemics. Rather than using prevalent population restrictions, these policy strategies are based on cyclical time restrictions. Key findings on the outcomes of such policy strategies include: a significant improvement of social welfare, substantially lessening the trade-offs between economic activity and health outcomes; optimally-derived timings of interventions are shown to suppress the disease, while maintaining reasonable economic activity; and outcomes are superior to the actual experience of New York State and Florida over the course of 2020.

We develop a Schumpeterian growth model to analyze the interaction between patent policy and firms' internal strategies to capture value from innovations. We consider two dimensions of patent policy: backward protection against imitation and forward protection, also known as blocking patents, against subsequent innovation that builds on a patented technology. Incumbent patent holders endogenously invest resources to protect their monopoly rents by impeding market entry of innovative competitors. We show that patent policy impacts economic growth through its influence on both the ex ante R&D incentives of potential innovators and the post-innovation rent protection incentives of incumbent firms. Most importantly, our analysis formalizes a novel growth-promoting role of forward protection; by guaranteeing previous innovators a share of future innovators' profits, forward protection reduces the incentive to actively obstruct follow-on innovations. We identify conditions under which the selective use of forward protection can stimulate economic growth through this mechanism.

This paper studies optimal taxes in a lifecycle model with unverifiable human capital investment inseparable from regular consumption. The planner faces asymmetric information regarding agents’ exogenous abilities and endogenous human capital. Agents deviate in two ways: misreporting ability and mis-investing in human capital. We characterize the distortions in a model with i.i.d. shocks and full human capital depreciation. Distortions are characterized by capital wedges that are positive over the life cycle, labor wedges that are negative early and positive later in the life cycle, and net human capital wedges that are positive in the life cycle. These wedges serve as mechanisms to eliminate the distortion to consumption due to inseparability from education expenditure. Calibrate to U.S. data, we show numerically that these results apply in a richer model with persistent shocks and non-full human capital depreciation. Simulation suggests that average capital wedges are positive in all working periods, with progressive capital wedges in contemporary skills, average labor wedges are negative in early and positive in later periods, with hump-shape in skills and nonzero at the top and the bottom of the skill distribution, and net human capital wedges are positive and regressive in skills, indicating that human capital subsidies are in favor of the high skilled.

This paper reassesses the conclusions of McGrattan and Prescott (2005), which derived the quantitative implications of growth theory for U.S. corporate valuations. In addition to having two more decades of data, the analysis incorporates recent changes in policies that affect corporate investments, taxes, and legal-form choice. Secular trends identified in the earlier period remain, with little change in the tangible capital-output ratio or profit share of output. Corporate valuations remain high relative to the postwar average, in line with the theoretical prediction. Critical to this prediction are the decline in effective tax rate on distributions and the rise of foreign direct investment abroad. With the recent enactment of the Tax Cuts and Jobs Act, corporate valuations are predicted to rise even further relative to GDP.

After 162 years of political unification, Italy still displays large regional economic differences. In 2019, the per capita GDP of Lombardia was 39,700 euros, but Calabria's per capita GDP was only 17,300 euros. We build a two-region, two-sector model of the Italian economy to measure the wedges that could account for the differences in aggregate variables between the North and the South. We find that the largest driver of the regional disparity in per capita output is the difference in total factor productivity, followed by fiscal redistribution. These two factors, together, account for more than 70 percent of the output disparity between the North and the South.

We examine the intensive and extensive margins of labor supply in an incomplete-markets framework where productivity keeps growing. What are, in particular, the long-run implications for who will work how much, and how the distribution of economic welfare among households will change? We insist the relative strengths of income and substitution effects to be such as to match historical and cross-country observations. That is, hours will fall toward zero as productivity and income rise, while wages per hour will keep rising and be consistent with stable income shares for labor and capital. Despite this rather drastic path toward zero hours worked, we find that few features of the distribution of outcomes in the population are affected much at all by productivity growth. In particular, the relative distribution of hours worked and of consumption will look very similar to the case without productivity growth.