It has been 70 days since the first case of COVID-19 was detected in the US. Since then it has spread and grown in all but 2 of 376 MSAs and all but 45 of the 636 counties that are contained in these MSA. In this paper we examine the determinants of how rapidly the virus grows once it has been...

It has been more than 100 days since the first case of COVID-19 was detected in the US. Until most recently information on the spread of the disease was not available by geographic areas smaller than counties. In an earlier piece we found a significant positive impact of county density on the...