What factors underlie industry differences in research intensity and productivity growth? We develop a multi-sector endogenous growth model allowing for industry specific parameters in the production functions for output and knowledge, and in consumer preferences. We find that industry...

The geographic concentration of economic activity occurs because transport costs for goods, people and ideas give individuals and organisations incentives to locate close to each other. Historically, all of these costs have been falling. Such changes could lead us to predict the death of...

A key feature of OECD economic growth since the early 1970s has been the secular decline in manufacturing's share of GDP and the secular rise of service sectors. This paper examines the role played by relative prices, technology, factor endowments, and labour market institutions in the process...

We study how the market for innovation affects enforcement of patent rights. Conventional wisdom associates the gains from trade with comparative advantage in manufacturing or marketing. We show that these gains imply that patent transactions should increase litigation risk. We identify a new...

We introduce a novel empirical strategy to measure credit shocks. Theoretically, we show that credit shocks reduce the value of long term investments relative to short term ones. Under the (conservative) assumption that demand shocks affect short and long run investments similarly, credit shocks...

Innovation processes within corporations increasingly tap into international technology sources, yet little is known about the relative contribution of different types of innovation channels. We investigate the effectiveness of different types of international technology sourcing activities...

We examine the "home bias" of international knowledge spillovers as measured by the speed of patent citations (i.e. knowledge spreads slowly over international boundaries). We present the first compelling econometric evidence that the geographical localization of knowledge spillovers has fallen...

How much does US-based R&D benefit other countries and through what mechanisms? We test the "technologysourcing" hypothesis that foreign research labs located on US soil tap into US R&D spillovers and improvehome country productivity. Using panels of UK and US firms matched to patent data we...

The commercial value of basic knowledge depends on the arrival of follow-up developments mostly from outside the boundaries of the inventing firm. Private returns would depend on the extent the inventing firm internalizes these follow-up developments. Such internalization is less likely to occur...