00369nam a2200133Ia 4500020001500000082001900015100001800034245004800052260003900100300002700139490005900166500000500225700000500230  a9812389296  a380.13bY21.IA  aYang, Xiaokai  aAn inframarginal approach to trade theoryb  aNew JerseybWorld Scientificc2005  axi, 525p. Bibl. Index.  aIncreasing returns and inframarginal Economics v v. 1  a  a