Terrorism 44 Prevention 34 Economic aspects 32 Mathematical models 32 Government policy 31 Economic conditions 27 Housing subsidies 26 more ... Economic policy 19 Population 17 Housing 15 Costs 14 Finance 14 Policy sciences 14 Employment 13 Forecasting 13 Foreign economic relations 13 Evaluation 12 International economic relations 11 Migration, Internal 11 Rates 11 Armed Forces 10 Decision making 10 Electric utilities 10 Energy policy 9 Petroleum industry and trade 9 Planning 9 Public housing 9 Public welfare 9 Terrorisme 9 Transportation 9 less ...