00390nam a2200133 a 450000500170000000800410001702000150005804100080007308200130008110000300009424500700012426400320019430000300022620260717091430.0260717s1990    ii            000 0 eng d  a0333518047  aeng04a338.60481 aPorter, Michael E., 1947-14aThe competitive advantage of nations /cPorter, Michael E., 1947- 1aLondon :bMacMillan,c1990.  axx, 855 p., tab. ; 23 cm.