00315nam a2200121 a 450000500170000008200160001710000240003324500510005725000120010826000320012030000220015270000190017420251203090810.0  a338.52bLEF  aLeftwich, Richard H  aPrice system and resource allocation economics  a9th ed.  aChicagobDryden Pressc1985  aXXII,631p.c23cm.  aEckert, Ross D