Technological progress takes the form of improvements in the quality of an array of intermediate inputs to production. In an equilibrium that is standard in the literature, all research is carried out by outsiders, and success means that the outsider replaces the incumbent as the industry...

Shifts in the extent of competition, which affect markups, are possible sources of aggregate fluctuations. Markups are countercyclical; during booms the economy operates more efficiently. In our benchmark model, markups correspond to the prices of differentiated inputs relative to that of...

The recent literature on endogenous economic growth allows for effects of fiscal policy on long-term growth. If the social rate of return on investment exceeds the private return, then tax policies that encourage investment can raise the growth rate and levels of utility. An excess of the social...

In the rare-disasters setting, a key determinant of the equity premium is the size distribution of macroeconomic disasters, gauged by proportionate declines in per capita consumption or GDP. The long-term national-accounts data for up to 36 countries provide a large sample of disaster events of...

In a world of integrated capital markets, the price of credit - which I measure by short-term expected real interest rates - is determined to equate the world aggregate of investment demand to the world aggregate of desired national saving. I implement this approach empirically by approximating...

In neoclassical growth models with diminishing returns to capital, a country's per capita growth rate tends to be inversely related to its initial level of income per person. This convergence hypothesis seems to be inconsistent with the cross-country evidence, which indicates that per capita...