Labor supply 4 China 2 City planning 2 Competition, International 2 Economic conditions 2 Economic development 2 Education 2 Effect of education on 2 Energy development 2 Energy industries 2 Energy policy 2 Environmental aspects 2 Manpower policy 2 Population 2 Poverty 2 Quality control 2 Standards 2 Urbanization 2 Business logistics 1 Coastal zone management 1 Economic aspects 1 Food industry and trade 1 Food security 1 Food supply 1 Sanitation 1 Sewage disposal 1 Sustainable development 1 Water utilities 1 Water-supply 1