Levchenko, Andrei A <br/><br/>
Ricardian productivity differences and the gains from trade / 
Andrei A. Levchenko and Jing Zhang 
 - Cambridge  NBER  2013 
 - 41p 
 - NBER Working Paper ;  19641 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>NBERWP 19641<br/>E10796.pdf