00349pab a2200121 454500008004000000100001900040245008200059260000900141300001600150362000800166650002400174773002900198180718b2008   xxu||||| |||| 00| 0 eng d  aChaney, Thomas  aDistorted gravity: the intensive and extensive margins of international trade  c2008  ap.1707-721.  aSep  aInternational trade  aAmerican Economic Review