What is pollution? According to Peter H. Aranson, “Public policy regards as pollution any man-made or naturally occurring substance (for example, smoke or sewage) or condition (for exam- ple, noise, heat, or radiation) that is believed to threaten human health or economic welfare...

What is pollution? According to Peter H. Aranson, “Public policy regards as pollution any man-made or naturally occurring substance (for example, smoke or sewage) or condition (for exam- ple, noise, heat, or radiation) that is believed to threaten human health or economic welfare...

This publication, which is based on the unique methodology and tools developed for the World Bank Institute/Harvard School of Public Health Flagship Course on Health System Reform and Sustainable Financing, provides a powerful set of resources to help policy makers better navigate the...

This paper estimates a dynamic, structural model of entry and exit in an oligopolistic industry and uses it to quantify the determinants of market structure and long-run firm values for two U.S. service industries, dentists and chiropractors. Entry costs faced by potential entrants, fixed costs...

In this article we study differences in the returns to R&D investment between firms that sell in international markets and firms that only sell in the domestic market. We use German firm-level data from the high-tech manufacturing sector to estimate a dynamic structural model of a firm's...

While there is widespread empirical evidence indicating exporting producers have higher productivity than nonexporters, the mechanisms that generate this pattern are less clear. One view is that exporters acquire knowledge of new production methods, inputs, and product designs from their...