We analyse the determinants of the decline in research productivity using panel data on manufacturing firms in the US for the period 1980-93. We focus on three factors: the level of demand, the quality of patents and technological exhaustion. We develop an index of patent 'quality' using...

So little is known about the rural nonfarm sector that those making policy to assist rural small-scale enterprises have done so largely"unencumbered by evidence". The Lanjouw survey of nonfarm data and policy experience attempts to correct this. Until recently, the commonly held view was that...

The authors construct and derive the properties of estimators of welfare that take advantage of the detailed information about living standards available in small household surveys and the comprehensive coverage of a census or large sample. By combining the strengths of each, the estimators can...

The decision to require that countries grant product patents for pharmaceutical innovations as a condition of membership in the World Trade Organization was very contentious. Almost fifty developing countries were not granting patent monopolies for drugs during the period the Uruguay round of...

In this paper we explore the substitutability of formal and informal property rights. We analyze new survey data from Ecuador, where households have both formal and informal claims to urban residential property. The latter come from a variety of sources, including the activity of a local boss,...

The decision to require that countries grant product patents for pharmaceutical innovations as a condition of membership in the World Trade Organization was very contentious. Almost fifty developing countries were not granting patent monopolies for drugs during the period the Uruguay round of...

We explore the substitutability of formal and informal property rights using new survey data from Ecuador, where households have both formal and informal claims to urban residential property. We develop a model of property transactions that distinguishes between transferable and...

The authors discuss the use of imputed data in regression analysis, in particular the use of highly disaggregated welfare indicators (from so-called"poverty maps"). They show that such indicators can be used both as explanatory variables on the right-hand side and as the phenomenon to explain on...

In this paper we explore the substitutability of formal and informal property rights. We analyze new survey data from Ecuador, where households have both formal and informal claims to urban residential property. The latter come from a variety of sources, including the activity of a local boss,...