In developing economies, substantial economic activity takes place in the informal labor market, beyond the reach of government policy. Labor market policies, which by definition apply only to the formal-sector labor market, then have important spillover effects. The relative sizes of the...

We model an environment in which different vintages of capital with their different productivities coexist. A reduction in the cost of investment induces investment in new capital which raises both measured capital and measured productivity simultaneously. We calibrate this model to...

There has been a vast recent literature which has emphasized the role of human capital and knowledge on the economic growth process. This paper presents a model where the knowledge occurs through solving "problems." These problems which are partially idiosyncratic to the country. We think of a...

A growth model is set up where war, population, and technology interact endogenously, capturing some trends observed throughout long-run human history. Agents compete for food for their survival. In environments with scarce resources -- meaning high population density, and/or low levels of...