This important book and its companion volume, Issues in Contemporary Microeconomics and Welfare, capture and convey the spirit, fundamental issues, underlying tensions, rich variety, accomplishments, and failures in contemporary economics. It presents economics as a dynamic subject, showing its strengths and limitations, exploring alternative approaches, and tracing the sources of differences. The essays include original contributions by the theorists themselves; major interpretations, reflections, and assessments by leading economists, and evaluations of particular areas by rising young scholars.