Amartya Sen - Research

Research

Sen's papers in the late 1960s and early 1970s helped develop the theory of social choice, which first came to prominence in the work by the American economist Kenneth Arrow, who, while working at the RAND Corporation, had most famously showed that all voting rules, be they majority rule or two thirds-majority or status quo, must inevitably conflict with some basic democratic norm. Sen's contribution to the literature was to show under what conditions Arrow's impossibility theorem would indeed come to pass as well as to extend and enrich the theory of social choice, informed by his interests in history of economic thought and philosophy.

In 1981, Sen published Poverty and Famines: An Essay on Entitlement and Deprivation (1981), a book in which he argued that famine occurs not only from a lack of food, but from inequalities built into mechanisms for distributing food. Sen also argued that the Bengal famine was caused by an urban economic boom that raised food prices, thereby causing millions of rural workers to starve to death when their wages did not keep up. However, this argument has recently been undermined by evidence suggesting significant decline in food availability in the Bengal Famine. This implies the curious irony that Sen had bought into precisely the excuse used by the War Cabinet to refuse aid to Bengal – that hoarding, not a lack of food, was the famine's cause.

Sen's interest in famine stemmed from personal experience. As a nine-year-old boy, he witnessed the Bengal famine of 1943, in which three million people perished. This staggering loss of life was unnecessary, Sen later concluded. He presents data that there was an adequate food supply in Bengal at the time, but particular groups of people including rural landless labourers and urban service providers like haircutters did not have the monetary means to acquire food as its price rose rapidly due to factors that include British military acquisition, panic buying, hoarding, and price gouging, all connected to the war in the region. In Poverty and Famines, Sen revealed that in many cases of famine, food supplies were not significantly reduced. In Bengal, for example, food production, while down on the previous year, was higher than in previous non-famine years. Thus, Sen points to a number of social and economic factors, such as declining wages, unemployment, rising food prices, and poor food-distribution systems. These issues led to starvation among certain groups in society. His capabilities approach focuses on positive freedom, a person's actual ability to be or do something, rather than on negative freedom approaches, which are common in economics and simply focuses on non-interference. In the Bengal famine, rural laborers' negative freedom to buy food was not affected. However, they still starved because they were not positively free to do anything, they did not have the functioning of nourishment, nor the capability to escape morbidity.

In addition to his important work on the causes of famines, Sen's work in the field of development economics has had considerable influence in the formulation of the Human Development Report, published by the United Nations Development Programme. This annual publication that ranks countries on a variety of economic and social indicators owes much to the contributions by Sen among other social choice theorists in the area of economic measurement of poverty and inequality.

Sen's revolutionary contribution to development economics and social indicators is the concept of 'capability' developed in his article "Equality of What." He argues that governments should be measured against the concrete capabilities of their citizens. This is because top-down development will always trump human rights as long as the definition of terms remains in doubt (is a 'right' something that must be provided or something that simply cannot be taken away?). For instance, in the United States citizens have a hypothetical "right" to vote. To Sen, this concept is fairly empty. In order for citizens to have a capacity to vote, they first must have "functionings." These "functionings" can range from the very broad, such as the availability of education, to the very specific, such as transportation to the polls. Only when such barriers are removed can the citizen truly be said to act out of personal choice. It is up to the individual society to make the list of minimum capabilities guaranteed by that society. For an example of the "capabilities approach" in practice, see Martha Nussbaum's Women and Human Development.

He wrote a controversial article in The New York Review of Books entitled "More Than 100 Million Women Are Missing" (see Missing women of Asia), analyzing the mortality impact of unequal rights between the genders in the developing world, particularly Asia. Other studies, such as one by Emily Oster, have argued that this is an overestimation, though Oster has recanted some of her conclusions.

Welfare economics seeks to evaluate economic policies in terms of their effects on the well-being of the community. Sen, who devoted his career to such issues, was called the "conscience of his profession." His influential monograph Collective Choice and Social Welfare (1970), which addressed problems related to individual rights (including formulation of the liberal paradox), justice and equity, majority rule, and the availability of information about individual conditions, inspired researchers to turn their attention to issues of basic welfare. Sen devised methods of measuring poverty that yielded useful information for improving economic conditions for the poor. For instance, his theoretical work on inequality provided an explanation for why there are fewer women than men in India and China despite the fact that in the West and in poor but medically unbiased countries, women have lower mortality rates at all ages, live longer, and make a slight majority of the population. Sen claimed that this skewed ratio results from the better health treatment and childhood opportunities afforded boys in those countries, as well as sex-specific abortion.

Governments and international organizations handling food crises were influenced by Sen's work. His views encouraged policy makers to pay attention not only to alleviating immediate suffering but also to finding ways to replace the lost income of the poor, as, for example, through public-works projects, and to maintain stable prices for food. A vigorous defender of political freedom, Sen believed that famines do not occur in functioning democracies because their leaders must be more responsive to the demands of the citizens. In order for economic growth to be achieved, he argued, social reforms, such as improvements in education and public health, must precede economic reform.

In 2009, a new book by Sen was published, The Idea of Justice. Based on his previous work in welfare economics and social choice theory, but also on his philosophical thoughts, he presented his own theory of justice that he meant to be an alternative to the influential modern theories of justice of John Rawls or John Harsanyi. In opposition to Rawls but also earlier justice theoreticians Immanuel Kant, Jean-Jacques Rousseau or David Hume, and inspired by the philosophical works of Adam Smith and Mary Wollstonecraft, Sen developed a theory that is both comparative and realizations-oriented (instead of being trancendental and institutional). However, he still regards institutions and processes as being important. As an alternative to Rawls's veil of ignorance, Sen chose the thought experiment of an impartial spectator as the basis of his theory of justice. He also stressed the importance of public discussion (understanding democracy in the sense of John Stuart Mill) and a focus on people's capabilities (an approach that he had co-developed), including the notion of universal human rights, in evaluating various states with regard to justice.