L14 - Transactional Relationships; Contracts and Reputation; Networks
O33 - Technological Change: Choices and Consequences; Diffusion Processes
D72 - Economic Models of Political Processes: Rent-Seeking, Elections, Legislatures, and Voting Behavior
R23 - Regional Migration; Regional Labor Markets; Population
R41 - Transportation: Demand, Supply, and Congestion; Safety and Accidents; Transportation Noise
R52 - Land Use and Other Regulations
R58 - Regional Development Policy