P3 Socialist Institutions and Their Transitions
- P30 General
- P31 Socialist Enterprises and Their Transitions
- P32 Collectives; Communes; Agriculture
- P33 International Trade, Finance, Investment, and Aid
- P34 Financial Economics
- P35 Public Economics
- P36 Socialist Institutions and Their Transitions: Consumer Economics; Health, Education and Training, Welfare, and Poverty
- P37 Legal Institutions; Illegal Behavior
- P39 Other