00325nam a2200133Ia 45000030006000000080041000060400015000471000019000622450034000812500010001152600037001255460012001620050017001740STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aGraaff Dev, J.  aTheoretical welfare economics  aFirst  bCambridge university pressc1967  aEnglish20220125165623.0