This book investigates the fundamental question of what metric should be used to evaluate equality within social and economic arrangements. Amartya Sen, a Nobel laureate in Economics, draws upon his extensive research in welfare economics and social choice theory to argue that equality should be assessed through the lens of human capabilities. He posits that focusing on resources or welfare alone is insufficient, proposing instead a framework that prioritizes the substantive freedoms individuals possess to achieve the lives they value.

Experts recognize this work as a foundational text in development economics and political philosophy. Readers frequently note the academic density of the prose, which requires careful engagement with Sen's rigorous logical arguments.