We examine the generalizability of internally valid estimates of causal effects in a fixed population over time when that population is subject to aggregate shocks. This temporal external validity is shown to depend upon the distribution of the aggregate shocks and the interaction between these...

The paper analyzes the link between human capital and firm-level productivity in five Asian countries. It draws on a dataset of over 4,000 enterprises and considers both the prior educational attainment of workers and in-service training programs of enterprises. Differences between small,...