As we approach the end of the second millennium, we find ourselves in times of radical social change. Orthodox explanations of the economy, the environment and the development process are unable to provide coherent policies for such issues as employment creation, environmental degradation and social progress. Economy-Environment-Development-Knowledge provides alternative perspectives on these fundamental aspects of human existence. Economists, environmentalists, and development theorists have so far been unable to agree on the most successful prescriptions to address problems. To understand, contrast and compare alternative understandings of economic, environmental and development issues, we need to be aware why theorists conceptualise the process of social experience so differently. Part 1 of Economy-Environment-Development-Knowledge addresses the subjective preference, cost-of-production and abstract labour theories of values in economics; Part 2 explains egocentrism, ecocentrism and socioecocentrism as competing theoretical perspectives in environmental theory; Part 3 highlights modernisation theory, structuralist theory and class struggle as ways to account for the process of development and Part 4 examines the generation of knowedge through positivism, paradigms and praxis, legitimating competing perspectives in economics, environmentalist and development. The book concludes by considering why different people find alternative explanations more or less plausible. By addressing the disagreements between theorists, Economy-Environment-Development-Knowledge provides a unique basis to contrast and compare the plethora of theories of, and policies for, economic prosperity, environmental sustainability and social progress.