00347pab a2200133 454500008004000000100001800040245006100058260000900119300001400128362000800142650001000150650002400160773002900184180718b2009   xxu||||| |||| 00| 0 eng d  aKrugman, Paul  aThe increasing returns revolution in trade and geography  c2009  ap.561-71.  aJun  aTrade  aInternational trade  aAmerican Economic Review