We survey the micro and macro literature on the impact of Information and Communication Technologies (ICTs) on productivity. The “Solow Paradox” of the absence of an impact of ICT on productivity no longer holds, if it ever did. Both growth accounting and econometric evidence suggest an...

National industrial concentration in the U.S. has risen sharply since the early 1980s, but there remains dispute over whether local geographic concentration has followed a similar trend. Using near population data from the Economic Censuses, we confirm and extend existing evidence on national...