Amartya Sen's

Amartya Sen (born 1933), the Bengali economist who won the 1998 Nobel Memorial Prize in Economic Sciences for his work in welfare economics, social choice theory, and the study of famines, developed a body of thought that reoriented development economics around human well-being. His central contribution—the capability approach—holds that the proper measure of a society's progress is not Gross Domestic Product or aggregate utility but the substantive freedoms ("capabilities") people enjoy to lead lives they have reason to value. Sen distinguishes between "functionings" (the actual states and activities a person achieves, such as being nourished, educated, or able to participate in community life) and "capabilities" (the real freedom or opportunity to achieve those functionings). This framework was elaborated in Commodities and Capabilities (1985), Development as Freedom (1999), and The Idea of Justice (2009), and was operationalised, with Pakistani economist Mahbub ul Haq, into the United Nations Development Programme's Human Development Index (HDI), first published in 1990.

Sen's earlier and equally examinable contribution is his entitlement theory of famine, advanced in Poverty and Famines: An Essay on Entitlement and Deprivation (1981). Studying the Bengal Famine of 1943, the Bangladesh famine of 1974, and the Ethiopian and Sahel famines, Sen argued that famines are caused not primarily by a decline in food availability but by collapses in people's "exchange entitlements"—their ability to command food through production, trade, labour, or transfers. The Bengal Famine, in which roughly three million died, occurred despite no catastrophic fall in aggregate food supply; wartime inflation and speculative hoarding destroyed the purchasing power of agricultural labourers. His celebrated dictum—that no substantial famine has ever occurred in a functioning democracy with a free press—links political freedom directly to survival. In social choice theory, Sen revived and extended the field opened by Kenneth Arrow's impossibility theorem, demonstrating in "The Impossibility of a Paretian Liberal" (1970) the tension between minimal liberty and Pareto efficiency.

Sen's influence is institutional and contemporary. The HDI and its successors—the Inequality-adjusted HDI, the Gender Inequality Index, and the Multidimensional Poverty Index (developed with the Oxford Poverty and Human Development Initiative)—remain central to UNDP reporting in 2026. With philosopher Martha Nussbaum he shaped the broader human-development paradigm, and he co-founded the Human Development and Capability Association. In India he co-authored, with Jean Drèze, An Uncertain Glory (2013), critiquing India's neglect of public health and education relative to East Asian peers.

For the UPSC examination, Sen recurs across multiple papers. In GS Paper I (Modern History and post-independence India) his famine analysis informs questions on the Bengal Famine of 1943 and colonial economic policy. In GS Paper II and III his capability approach underpins discussions of human development, the HDI, inequality, and welfare schemes. The Essay paper and Philosophy/Economics optionals test Development as Freedom directly. The typical question angle asks candidates to contrast income-based and capability-based measures of development, or to apply entitlement theory to food security and the National Food Security Act, 2013.