00278nam a2200109 a 450000500170000008200160001710000260003324500410005926000320010030000220013263000140015420251202164232.0  a338.52bLEF  aLeftwich ,  Richard H  aPrice system and resource allocation  aChicagobDryden Pressc1985  a631 p.b22cm.cPB  aEconomics