Using a new global data base on patents and innovation inputs, the authors examine the process of knowledge creation measured by the dynamic relationship between research and development and U.S. patents granted. They confirm at the country level the recurrent micro-level finding of a strong...

Product standards can have a dual impact on production and trade costs. Standards may impose additional costs on exporters as it may be necessary to adapt products for specific markets (cost-effect). In contrast, standards can reduce exporters'information costs if they convey information on...

This paper formalizes the design of experiments intended specifically to study spillover effects. By first randomizing the intensity of treatment within clusters and then randomly assigning individual treatment conditional on this cluster-level intensity, a novel set of treatment effects can be...

For reason of empirical tractability, analysis of cointegrated economic time series is often developed in a partial setting, in which a subset of variables is explicitly modeled conditional on the rest. This approach yields valid inference only if the conditioning variables are weakly exogenous...

This paper assesses the effect of institutional quality on research and development (R&D) expenditures in developing countries. The paper finds that the risk of expropriation and the rule of law are correlated with R&D expenditures. Since both institutional variables increase as institutional...

Many more impact evaluations could be done, and at lower unit cost, if evaluators could avoid the need for baseline data using objective socio-economic surveys and rely instead on retrospective subjective questions on how outcomes have changed, asked post-intervention. But would the results be...

This paper analyzes the relationship between the number of documents required to export and import and the time it takes to complete all procedures to trade. It shows that an increase in the number of documents required for export and import tends to increase the time cost of shipments. However,...

Studies comparing household surveys with on-site interceptor surveys have typically accounted for over-sampling avid users in the on-site interceptor surveys (that is, endogenous stratification). However, these studies have typically not accounted for the possibility that the household sample...

Using UNESCO data for research and development (R&D) expenditures and personnel, the authors document international differences in R&D activities and assess the determinants of these differences and the link between R&D and economic growth. For a group of OECD countries, R&D activity and...

The very poor in developing countries often make intertemporal choices that seem at odds with their individual self-interest. There are many possible reasons why. This paper investigates several of these reasons with a lab-in-the-field experiment in rural Malawi involving large stakes. It makes...