"Do we get enough of a diagnosis of individual in poverty by comparing the individual's income with a socially given poverty-line income? What about the person with an income well above the poverty line who suffers from an expensive illness (requiring, say, kidney dialysis)? Is deprivation not ultimately a lack of opportunity to lead a minimally acceptable life, which can be influenced by a number of considerations, including of course personal income, but also physical and environmental characteristics and other variables...?" That is from Amartya Sen's New Introduction (2017) to the expanded edition of his classic COLLECTIVE CHOICE AND SOCIAL WELFARE. The original edition of this work is dated 1970. The point Sen is making in that quote is in a sense a trivial one. OF COURSE, you might want to say, the mere numerical fact of an income level, contrasted with some arbitrary poverty-line number does not give us a full picture of the condition of any particular "...