Empirical cross-industry cross-country models are applied widely in economics, for example to investigate the determinants of economic growth or international trade. Estimation generally relies on US proxies for unobservable technological industry characteristics, for example industries'...

We mailed letters to non-existent business addresses in 159 countries (10 per country), and measured whether they come back to the return address in the US and how long it takes. About 60% of the letters were returned, taking over 6 months, on average. The results provide new objective...

This paper uses three different sources of data to investigate the association between the business cycle--measured with unemployment rates--and environmental concern. Building on recent research that finds internet search terms to be useful predictors of health epidemics and economic activity,...

On the fortieth anniversary of the Clean Water Act this paper reports the first quantitative assessment of the aggregate trends in water quality in the U.S. using a single standard over the years 1975 to 2011. The analysis suggests that fresh water lakes for the nation as a whole are about at...