Economic conditions 29 Research 20 Mathematical models 15 Congresses 14 Econometric models 10 Periodicals 9 Risk assessment 9 Bibliography 8 Case studies 8 Economic aspects 8 Transportation 8 Consumers 7 Finance 7 History 7 Commerce 6 Industries 6 Manufactures 6 Statistics 6 Accounting 5 Corporations 5 Cost and standard of living 5 Economic policy 5 Education 5 Employment 5 Families 5 Income 5 Marketing research 5 Saving and investment 5 Auditing 4 Economics 4