Economic growth and complementarity between stages of human capital

We study the impact of the different stages of human capital accumulation on the evolution of labor productivity in a model calibrated to the U.S. from 1961 to 2008. We add early childhood education to a standard continuous time life cycle economy and assume complementarity between educational stages. There are three sectors in the model: the goods sector, the early childhood sector and the formal education sector. Agents are homogenous and choose the intensity of preschool education, how long to stay in formal school, labor effort and consumption, and there are exogenous distortions to these four decisions. The model matches the data very well and closely reproduces the paths of schooling, hours worked, relative prices and GDP. We find that the reduction in distortions to early education in the period was large and made a very strong contribution to human capital accumulation. However, due to general equilibrium effects of labor market taxation, marginal modification in the incentives for early education in 2008 had a smaller impact than those for formal education. This is because the former do not decisively affect the decision to join the labor market, while the latter do. Without labor taxation, incentives for preschool are significantly stronger.

Health Care Reform or More Affordable Health Care?

This article investigates the impact on the U.S. economy of making health care more affordable. We compare health care cost reductions with the Patient Protection and Affordable Care Act (PPACA) using a rich life cycle general equilibrium model with heterogeneous agents. We found that all policies were able to reduce uninsured population, but the PPACA was the most effective: in the long run, less than 5% of Americans would remain uninsured. Cost reductions alleviated the government budget, while tax hikes were needed to finance the reform. Feasible cost reductions are less welfare improving than the PPACA.

Is there a general criterion for dynamic efficiency?

This paper analyses an overlapping generations model with absolute bequest motive. It is shown that the widely accepted criterion to verify dynamic efficiency does not apply to this case. In our model the social planner maximizes welfare by choosing a capital stock larger than the golden role and a real rate of interest smaller than the rate of growth of the economy.

First-Price auction symmetric equlibria with a general distribution

In this paper I obtain the mixed strategy symmetric equilibria of the first-price auction for any distribution. The equilibrium is unique. The solution turns out to be a combination of absolutely continuous distributions case and the discrete distributions case.

First-price auction symmetric equilibria with a general distribution

In this paper I obtain the mixed strategy symmetric equilibria of the first-price auction for any distribution. The equilibrium is unique. The solution turns out to be a combination of absolutely continuous distributions case and the discrete distributions case.

Bubbles, collateral and monetary equilibrium

Consider an economy where infinite-lived agents trade assets collateralized by durable goods. We obtain results that rule out bubbles when the additional endowments of durable goods are uniformly bounded away from zero, regardless of whether the asset’s net supply is positive or zero. However, bubbles may occur, even for state-price processes that generate finite present value of aggregate wealth. First, under complete markets, if the net supply is being endogenously reduced to zero as a result of collateral repossession. Secondly, under incomplete markets, for a persistent positive net supply, under the general conditions guaranteeing existence of equilibrium. Examples of monetary equilibria are provided.

Governança,alavancagem e ciclicidade: a eficiência do modelo brasileiro de private equity

Este trabalho objetiva analisar a eficiência dos comitês de investimento no modelo de investimento em private equity através de FIPs (Fundos de Investimento em Participações) que não utilizam alavancagens em suas aquisições. Tal análise é feita através de uma comparação com o modelo americano, no qual tipicamente o gestor do fundo tem o poder de decisão sobre os investimentos e as aquisições são realizadas utilizando financiamento de terceiros. A dissertação é iniciada com uma revisão bibliográfica não-exaustiva dos trabalhos da academia brasileira sobre o tema de private equity. Em seguida, levanta-se as particularidades do modelo dos FIPs, principalmente a decisão de investimento feita em conjunto pelo gestor e seus investidores através de comitês de investimento e a rara utilização de alavancagem nas aquisições, e demonstra-se como o impacto destas características altera o equilíbrio do modelo proposto por Axelson, Strömberg e Weisbach. Conclui-se que as particularidades do modelo dos FIPs que não utilizam alavancagens nas aquisições oferecem: (i) melhor proteção aos interesses dos investidores, e uma representativade similar aos conselhos de administração de companhias abertas, e (ii) permitem que o gestor aproveite os períodos nos quais as transações ocorrem a um múltiplo mais baixo, resultando num modelo mais eficiente de investimento e que evita a multiplicação dos ciclos econômicos. Tais conclusões, no entanto, estão sujeitas à observação das seguintes condições: (i) o comitê deve ter qualificação igual ou superior ao do gestor; (ii) o comitê deve ter disponibilidade de tempo e corpo suficientes para analisar os investimentos nas mesma profundidade que o gestor, (iii) a existência do comitê de investimento não deve acarretar numa desvantagem para o gestor em termos de agilidade de resposta nas negociações. Finalmente, são levantadas algumas situações de ponteciais conflitos de interesse nas quais os membros dos comitês de investimento podem se encontrar.

Affiliation, equilibrium existence and the revenue ranking of auctions

We consider private value auctions where bidders’ types are dependent, a case usually treated by assuming affiliation. We show that affiliation is a restrictive assumption in three senses: topological, measure-theoretic and statistical (affiliation is a very restrictive characterization of positive dependence). We also show that affiliation’s main implications do not generalize for alternative definitions of positive dependence. From this, we propose new approaches to the problems of pure strategy equilibrium existence in first-price auctions (PSEE) and the characterization of the revenue ranking of auctions. For equilibrium existence, we slightly restrict the set of distributions considered, without loss of economic generality, and offer a complete characterization of PSEE. For revenue ranking, we obtain a characterization of the expected revenue differences between second and first price auctions with general dependence of types.