I had no idea. I know him from his currency union papers and his presentation on them at the AEA. I (vehemently!) disagree with the conclusions of his papers -- that currency unions increase trade a lot (it's really just a simple endogeneity issue, and not that difficult to get around); nevertheless, his blog looks interesting, and he certainly is not the first mainstream economist to be fooled by endogeneity...
Friday Night Music: Warpaint, Elephants
8 hours ago