00338nam a2200133 a 450000500170000002000150001708200130003210000210004524500350006625000110010126000500011230000230016270000190018520251203110337.0  a0030244765  a330bWEL  aWelch, Patrick J  aEconomicsbtheory and practice  a6th ed  aFort WorthbHarcourt College Publishersc1998  axxv,678p.c22cm.PB  aWelch, Gerry F