"Spheres of Justice" presents a theory of justice based on the concept of complex equality, arguing against a single, overarching principle for justice across all societal domains. Instead, it posits that different spheres of society—such as the market, politics, education, and family—each have their own distinct forms of social goods and require separate sets of distributive principles. The book challenges the idea of a dominant currency, like money or power, being allowed to dictate outcomes across different spheres, advocating for a pluralistic approach that respects the unique distributive patterns and criteria of justice within each sphere, thereby preventing the dominance of any one sphere over the others and ensuring a more equitable society.

"Principles of Political Economy" is a foundational text in the field of economics, providing an extensive exploration of economic theories and practices. The book discusses various economic principles such as production, distribution, and consumption, and examines the effects of societal progress on economic growth. It delves into topics like the division of labor, the role of capital, and the impact of government policies on economic activities. The author also critically analyzes different economic systems, including capitalism and socialism, and advocates for reforms that promote social justice and economic efficiency. This work is notable for its attempt to synthesize moral and economic considerations, influencing both contemporary economic thought and policy-making.