Competition, innovation and growth with limited commitment

We study how barriers to business start-up affect the investment in knowledge capital when contracts are not enforceable. Barriers to business start-up lower the competition for knowledge capital and, in absence of commitment, reduce the incentive to accumulate knowledge. As a result, countries with large barriers experience lower income and growth. Our results are consistent with cross-country evidence showing that the cost of business start-up is negatively correlated with the level and growth of income.Innovation, Knowledge Capital, Enforcement, Growth, Competition, Commitment, Recursive Contracts, Mobility

Competition, Human Capital and Income Inequality with Limited Commitment

We develop a dynamic general equilibrium model with two-sided limited commitment to study how barriers to competition, such as restrictions to business start-up, affect the incentive to accumulate human capital. We show that a lack of contract enforceability amplifies the effect of barriers to competition on human capital accumulation. High barriers reduce the incentive to accumulate human capital by lowering the outside value of ‘skilled workers’, while low barriers can result in over-accumulation of human capital. This over-accumulation can be socially optimal if there are positive knowledge spillovers. A calibration exercise shows that this mechanism can account for significant cross-country income inequality.Limited commitment, limited enforcement, human capital accumulation, income inequality, innovation, barriers to competition.

Financial innovations and macroeconomic volatility

The volatility of US business cycles has declined during the last two decades. During the same period the financial structure of firms has become more volatile. In this paper we develop a model in which financial factors are central for generating economic fluctuations. Innovations in financial markets allow for greater financial flexibility and generate a lower volatility of output together with a higher volatility in the financial structure of firms.

International recessions

The 2007–2009 crisis was characterized by an unprecedented degree of international synchronization as all major industrialized countries experienced large macroeconomic contractions around the date of Lehman bankruptcy. At the same time countries also experienced large and synchronized tightening of credit conditions. We present a two-country model with financial market frictions where a credit tightening can emerge as a self-fulfilling equilibrium caused by pessimistic but fully rational expectations. As a result of the credit tightening, countries experience large and endogenously synchronized declines in asset prices and economic activity (international recessions). The model suggests that these recessions are more severe if they happen after a prolonged period of credit expansion.

Financial Innovations and Macroeconomic Volatility

The volatility of US business cycles has declined during the last two decades. During the same period the financial structure of firms has become more volatile. In this paper we develop a model in which financial factors play a key role in generating economic fluctuations. Innovations in financial markets allow for greater financial flexibility and generate a lower volatility of output together with a higher volatility in the financial structure of firms.

Stock Market Boom and the Productivity Gains of the 1990s

Together with a sense of entering a New Economy, the US experienced in the second half of the 1990s an economic expansion, a stock market boom, a financing boom for new firms and productivity gains. In this paper, we propose an interpretation of these events within a general equilibrium model with financial frictions and decreasing returns to scale in production. We show that the mere prospect of high future productivity growth can generate sizable gains in current productivity, as well as the other above mentioned events.

Uninsurable Investment Risks

The authors study a general-equilibrium economy in which agents have the ability to invest in a risky technology. The investment risk cannot be fully insured with optimal contracts, because shocks are private information. The authors show that the presence of these risks may lead to an underaccumulation of capital relative to an economy where idiosyncratic shocks can be fully insured. They also show that, although the availability of state-contingent (optimal) contracts cannot provide full insurance, it brings the aggregate stock of capital close to the complete markets level. Institutional reforms that make the use of these contracts possible have important welfare consequences.Economic models; Financial institutions; Financial markets

Aggregate Consequences of Limited Contract Enforceability

We study a general equilibrium model in which entrepreneurs finance investment with optimal financial contracts. Because of enforceability problems, contracts are constrained efficient. We show that limited enforceability amplifies the impact of technological innovations on aggregate output. More generally, we show that lower enforceability of contracts will be associated with greater aggregate volatility. A key assumption for this result is that defaulting entrepreneurs are not excluded from the market.

The Welfare Cost of Market Incompleteness: Opitmal Financial Contracts with Non-Enforceability Constraints

In this paper we develop a general equilibrium model in which firms finance investment by signing long-term contracts with a financial intermediary. Due to enforceability problems, financial contracts are constrained optimal, that is, they maximize the surplus of the contract subject to incentive compatibility constraints. By comparing this model with an alternative model in which contracts are fully enforceable, we evaluate the quantitative importance of non-enforceability for the aggregate allocation of the economy. We find that in the steady state the welfare level in the economy with enforceable contracts is 2.6 percent larger than in the economy with non-enforceable contracts.

Understanding the U.S. distribution of wealth

This article describes the current state of economic theory intended to explain the unequal distribution of wealth among U.S. households. The models reviewed are heterogeneous agent versions of standard neoclassical growth models with uninsurable idiosyncratic shocks to earnings. The models endogenously generate differences in asset holdings as a result of the household's desire to smooth consumption while earnings fluctuate. Both of the dominant types of models--dynastic and life cycle models--reproduce the U.S. wealth distribution poorly. The article describes several features recently proposed as additions to the theory based on changes in earnings, including business ownership, higher rates of return on high asset levels, random capital gains, government programs to guarantee a minimum level of consumption, and changes in health and marital status. None of these features has been fully analyzed yet, but they all seem to have potential to move the models in the right direction.Wealth