Mathematical models 22 Cable television 18 Power resources 11 Rates 10 Economic conditions 9 Electric utilities 9 City planning 8 more ... Computer-assisted instruction 8 Municipal services 8 Algebra 6 Data processing 6 Technological innovations 6 Fuel consumption 5 Study and teaching 5 Artificial intelligence 4 Automobiles 4 Case studies 4 Electronic data processing 4 Energy conservation 4 Energy consumption 4 Labor supply 4 Political participation 4 Pricing 4 Problem solving 4 Recessions 4 Urban economics 4 Economic surveys 3 Education, Higher 3 Game theory 3 Power (Mechanics) 3 less ...