Income Economic conditions 40 Wealth 18 Cost and standard of living 17 Mathematical models 16 Consumption (Economics) 14 Wages 14 Economic policy 13 Poor 12 Economic aspects 9 Families 9 Prices 9 Gross national product 8 Income distribution 8 Labor supply 8 Case studies 7 Finance 7 Consumers 6 Economics 6 Income tax 6 Panel analysis 6 Taxation 6 Accounting 5 Congresses 5 History 5 Public welfare 5 Statistics 5 Business cycles 4 Commerce 4 Economic development 4