1成本分析第7章2成本的经济分析7.13短期•Theshortrun:Theperiodinwhichfirmscanadjustproductiononlybychangingvariablefactorssuchasmaterialsandlaborbutcannotchangefixedfactorssuchascapital.4固定成本•Thecostrelatedtofixedfactorsiscalledfixedcost(固定成本,不变成本).•Afirm’sfixedcosts,sometimescalled“overhead”(企业一般管理费用)or“sunkcosts”(沉入成本),mustbepaidevenifthefirmproducesnooutput,andt...