Part I: Introduction to welfare economics: 1. Measuring changes in economic welfare: consumer and producer surplus – 2. Consumers and producers: some basic theory – 3. Welfare change in general equilibrium – 4. Equity and efficiency - Part II: Project and policy appraisal in developing countries: 5. Project appraisal: an overview – 6. Shadow prices for traded and non-traded commodities in an open economy – 7. Trade policy, exchange rates and structural adjustment – 8. Labour markets in developing countries – 9. The social value of labour – 10. Intertemporal costs and benefits (1): a market-based approach – 11. Intertemporal costs and benefits (2): a social planning approach - Part III: Missing markets: 12. Externalities and public goods – 13. Risk and the measurement of welfare change – 14. Natural resources and the environment