00309nam a2200121Ia 45000030006000000080041000060400015000471000023000622450039000852600034001245460012001580050017001700STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aRichard Lipsey, G.  aIntroduction to positive economics  bWeidenfeld and Nicolsonc1965  aEnglish20220125165608.0