When the patent on a drug expires, there are substantial welfare gains to those consumers who, like the Food and Drug Administration, regard branded and generic versions as perfect substitutes. Standard price indexes fail to reflect this, since they treat generics as distinct new goods and 'link...

Is the fall in overall productivity growth in the United States and other developed countries related to the rising share of the service sectors in the economy? Since services represent well over half of the U.S. gross national product, it is also important to ask whether these sectors have had...

We present a model of endogenous firm growth with R&D investment and stochastic innovation as the engines of growth. The model for firm growth is a partial equilibrium model drawing on the quality ladder models in the macro growth literature, but also on the literature on patent races and the...