TY - JOUR AU - Bradford,David F. TI - Factor Prices May Be Constant but Factor Returns Are Not JF - National Bureau of Economic Research Reprint Series VL - No. 368 PY - 1983 Y2 - May 1983 UR - http://www.nber.org/papers/r0368 N1 - Author contact info: David F. Bradford Woodrow Wilson School Princeton University Princeton, NJ 08544-1013 Tel: 609/258-1856 Fax: 609/258-2809 E-Mail: BRADFORD@PRINCETON.EDU AB - ER -