上游充通大学 Scarcity SHANGHAI JIAO TONG UNIVERSITY "I mean all things,material or immaterial,that are scarce,that is to say,on the one hand,useful to us and,on the other hand,only available to us in limited quantity."(Walras,1926,p65) 强 AMMM SHANC 1日GScarcity “I mean all things, material or immaterial, that are scarce, that is to say, on the one hand, useful to us and, on the other hand, only available to us in limited quantity.” (Walras, 1926，p65）