100=aacr2 1900- 1900-1978 1931- 330 339 businesscycles centralplanning chaoticbehaviorinsystems competition computationalcomplexity congresses controltheory dataprocessing differentialequations discrete-timesystems econometricmodels economicconditions economicdevelopment economicforecasting economicpolicy economics equilibrium(economics) evolutionaryeconomics finance financialengineering gametheory harrod industries macroeconomics mathematical mathematicaleconomics mathematicalmodels mathematicaloptimization motion nonlinear nonlineartheories phasediagrams prices revolutionsandsocialism roy royforbes ryūzō satō socialaspects socialevolution socialpolicy sustainabledevelopment time timeandeconomicreactions timeandeconomicreations uncertainty unitedstates wages