The relevance of imperfect competition for models of aggregate economic fluctuations has received increased attention from researchers in both macroeconomics and industrial organization. Measuring properly the size of industry markups of price over marginal cost is important both for assessing...

The reawakening of interest in links between price flexibility and fluctuations in economic activity calls for a reconsideration of models of price and quantity adjustment. We examine relationships between credit disturbances and real activity under flexible prices, using monthly data on real...

Vaccinating the world's population quickly in a pandemic has enormous health and economic benefits. We analyze the problem faced by governments in determining the scale and structure of procurement for vaccines. We analyze alternative approaches to procurement. We find that if the goal is to...