This paper presents a dynamic partial equilibrium model that endogenizes firms' investment decision on innovation: product innovation causes horizontal expansion growth, and process innovation causes vertical expansion growth. Market structure in different markets emerges as a consequence of...

Personal income distribution in the USA has a well-defined two-class structure. For the lower class, to which the majority of population (97-99%) belongs, income distribution is the characterized by the exponential law. For the upper class (1-3% of population), income distribution follows the...

Cash-in-advance models usually require agents to reallocate money and bonds in fixed periods. Every month or quarter, for example. I show that fixed periods underestimate the welfare cost of inflation. I use a model in which agents choose how often they exchange bonds for money. In the benchmark...

We model the impact of public and private ownership structures on firms' incentives to invest in innovative projects. We show that it is optimal to go public when exploiting existing ideas and optimal to go private when exploring new ideas. This result derives from the fact that private firms...

Capital flows with low intensity and flows to middle-income countries. Physical and human capital alone cannot explain this pattern. I present a model to show how managerial ability--the ability to run risky projects--can increase total factor productivity and explain the pattern of capital...

We model the impact of public and private ownership structures on firms' incentives to choose innovative projects. Innovation requires the exploration of new ideas with potential advantages but unknown probability of success. We show that it is optimal to go public when firms wish to exploit the...

Newly assembled macroeconomic statistics for early modern Portugal reveal one of Europe’s most vigorous colonial traders and at the same time one of its least successful growth records. Using an estimated model in the spirit of Allen (2009) we conclude that intercontinental trade had a...

In this note we show that the claim from Chen et al (2005) that their model generates an endogenous markup is incorrect. This is not only a nomenclature issue: using the �fixed markup which we show to be the only one consistent with the structure of the model implies the main conclusions in...