This paper investigates the claim, often put forth by real business cycle proponents, that the poor performance of their models in matching real-world aggregate labor market behavior is due to the fact that observed real wage payments do not correspond to the actual marginal productivity of labor but contain an insurance component that cannot be accounted for by the Walrasian pricing mechanism. To test this idea, we dispense with the Walrasian description of the labor market and introduce contractual arrangements between employees and employers. Assuming that employees are prevented from accessing capital markets and are more risk averse than employers, we use the theory of optimal contracts to derive an equilibrium relation between aggregate states of the economy and wage-labor outcomes. This contractual arrangement is then embedded into a standard one-sector, stochastic neoclassical growth model in order to look at the business cycle implications of the contractual hypothesis. The resulting dynamic equilibrium relations are then parameterized and studied by means of standard numerical approximation techniques. The quantitative properties of our model appear to be somewhat encouraging. We have examined different contractual environments, and in all circumstances the contracts-based equilibrium performs better than standard ones with regard to the labor market variables and at least as well with regard to the other aggregate macroeconomic variables. The present paper reports only the simulation results relative to what we consider the most empirically relevant cases.

This paper investigates the claim, often put forth by real business cycle proponents, that the poor performance of their models in matching real-world aggregate labor market behavior is due to the fact that observed real wage payments do not correspond to the actual marginal productivity of labor but contain an insurance component that cannot be accounted for by the Walrasian pricing mechanism. To test this idea, we dispense with the Walrasian description of the labor market and introduce contractual arrangements between employees and employers. Assuming that employees are prevented from accessing capital markets and are more risk averse than employers, we use the theory of optimal contracts to derive an equilibrium relation between aggregate states of the economy and wage-labor outcomes. This contractual arrangement is then embedded into a standard one-sector, stochastic neoclassical growth model in order to look at the business cycle implications of the contractual hypothesis. The resulting dynamic equilibrium relations are then parameterized and studied by means of standard numerical approximation techniques. The quantitative properties of our model appear to be somewhat encouraging. We have examined different contractual environments, and in all circumstances the contracts-based equilibrium performs better than standard ones with regard to the labor market variables and at least as well with regard to the other aggregate macroeconomic variables. The present paper reports only the simulation results relative to what we consider the most empirically relevant cases.

When credit markets to finance investment in human capital are missing, the competitive equilibrium allocation is inefficient. When generations overlap, this failure can be mitigated by properly designed social arrangements. We show that public financing of education and public pensions can be designed to implement an intergenerational transfer scheme supporting the complete market allocation. Neither the public financing of education nor the pension scheme we consider resemble standard ones. In our mechanism, via the public education system, the young borrow from the middle aged to invest in human capital. They pay back the debt via a social security tax, the proceedings of which finance pension payments. When the complete market allocation is achieved, the rate of return implicit in this borrowing-lending scheme should equal the market rate of return.

We study the indeterminacy of equilibria in infinite horizon capital accumulation models with technological externalities. Our investigation encompasses models with bounded and unbounded accumulation paths, and models with one and two sectors of production. Under reasonable assumptions we find that equilibria are locally unique in one-sector economies. In economies with two sectors of production it is instead easy to construct examples where a positive external effect induces a two-dimensional manifold of equilibria converging to the same steady state (in the bounded case) or to the same constant growth rate (in the unbounded case). For the latter we point out that the dynamic behavior of these equilibria is quite complicated and that persistent fluctuations in their growth rates are possible.

According to a common argument, the presence of strong intellectual property rights spurs innovation, which then leads to fiercer competition, higher economic growth and increasing benefits for the average consumers. We argue that, in the case of intellectual property rights, this has lead to misconceptions and abuses. Current legislation on intellectual property confuses the protection of property rights on objects in which ideas are embodied with the attribution of monopoly power on the idea itself and, furthermore, with restrictions on the usage of such goods on the part of the buyers. This implies that both patent and copyright laws should be dramatically altered. To back up our claim we provide theoretical arguments, even for the most extreme case in which goods are produced at a positive fixed cost and zero marginal cost.

Empirical research has reached the puzzling conclusion that stronger patents do little or nothing to encourage innovation. We show that the facts that have led to the assumption of fixed cost in the discovery process can be equally well explained by a standard model of diminishing returns. This may explain much of the misunderstanding of the (supposedly positive) role of monopoly in innovation and growth, thereby accounting for the empirical puzzle.

Two modifications are introduced into the standard real-business-cycle model: habit preferences and a two-sector technology with limited intersectoral factor mobility. The model is consistent with the observed mean risk-free rate, equity premium, and Sharpe ratio on equity. In addition, its business-cycle implications represent a substantial improvement over the standard model. It accounts for persistence in output, comovement of employment across different sectors over the business cycle, the evidence of “excess sensitivity” of consumption growth to output growth, and the “inverted leading-indicator property of interest rates,” that interest rates are negatively correlated with future output.