1881-1973 1899-1992 1930-2014 20thcentury austria becker biography bus069030 business businessethics capital centralplanning chicagoschoolofeconomics competition congresses economicaspects economicpolicy economics economicsystems economictheory economists entrepreneurship environmentaleconomics freeenterprise hayek history liberalism ludwig macroeconomics marxianeconomics microeconomics moralandethicalaspects neoclassicalschoolofeconomics philosophy socialchoice structures technologicalinnovations theory timeandeconomicreactions uncertainty vonmises wienerschule(wirtschaftswissenschaften)