Forecasting Economic aspects 13 Agriculture 11 Mathematical models 11 Tourism 11 Congresses 10 Economic forecasting 10 Energy consumption 9 Forecasts 9 Food supply 8 Twenty-first century 8 Economic conditions 7 Power resources 7 Prices 6 Research 6 Statistics 6 Appropriations and expenditures 5 Data processing 5 Medical care 5 Social change 5 Civilization, Modern 4 Econometric models 4 Education 4 Employment forecasting 4 Fuel 4 Information technology 4 Methodology 4 Produce trade 4 Social aspects 4 Telecommunication 4