Among the contemporary economists who have given the greatest attention to poverty and deprivation, Amartya Sen and Jean Dreze are particularly outstanding. Their research on well-being, quality of life, and hunger set a standard for the point of view that says that life quality and deprivation need to be at the top of the list of economic research goals. Here I'm thinking of books like Inequality Reexamined, Poverty and Famines: An Essay on Entitlement and Deprivation, and Hunger and Public Action.
The neoclassical free market purists stand at the other end of the garden. The economists of the Chicago School put primary emphasis on the beneficent effects of untrammeled market behavior, and they give little attention to the "market imperfections" that poverty and deprivation represent. (The word "poverty" does not occur in the index of John Van Overtveldt's good intellectual history of the Chicago School, The Chicago School: How the University of Chicago Assembled the Thinkers Who Revolutionized Economics and Business.) Poverty seems to be viewed as a normal and fair result of the workings of market institutions: some people make large contributions and earn high income, and others make small or zero contributions and earn low income.
The closing chapter of Milton Friedman's Capitalism and Freedom is entitled "The Alleviation of Poverty." Here Friedman admits that poverty is a problem, but conceives of only two solutions: private charity (which he agrees will not work in a large complex society) and direct transfers from tax revenues to payments to the poor (which is limited by the willingness of citizens to provide taxes for this purpose). The mechanism he prefers is a negative income tax: persons with incomes below a given threshold would receive payments determined by their income levels. "In this way, it would be possible to set a floor below which no man's net income (defined now to include the subsidy) could fall" (192).
What this analysis leaves out is any consideration of the economic mechanisms that produce poverty within an affluent society, and how institutions could be adjusted so that poverty and inequality tended to fall over time as a consequence of the normal workings of economic institutions. Take race in America, for example -- a set of institutions that many observers see as being crucial mechanisms in the production of urban poverty. Writing in 1962, Friedman argues that racial discrimination in employment is essentially impossible within a competitive market system (link). But we now understand the geography and social structuring of poverty much better. Racial segregation in housing has not disappeared; it has only worsened. Low-quality and ineffective schools are concentrated in low-income and racially segregated neighborhoods, so poor people have reduced educational opportunities. Access to jobs is also constrained by geography and educational opportunity. (Here is a recent post on the mechanisms of racial disparities; link). So it seems clear that our economy systematically reproduces poverty in inner cities rather than reducing it. And the situation of rural poverty is not substantially better.
This all has to do with the dynamics of income at the bottom end. But we have also seen persistent widening of income at the top end. American capitalism has produced ever-widening inequalities of income for at least the past forty years. Consider these two graphs of income by percentile provided by Lane Kenworthy:
(Source: Lane Kenworthy, Consider the Evidence blog (link))
So the idea that a properly functioning market economy will tend to reduce poverty and narrow the extremes of income inequality has been historically refuted -- at least in the case of American capitalism.
It is apparent that the ills of poverty are debilitating to the families who experience it; their quality of life is dramatically lower than it needs to be in an affluent society. So that is one reason for economists to give higher priority to the study of the mechanisms and structures that reproduce poverty in the United States. But there is a more systemic reason as well: if 15% of all Americans live in poverty (46 million people), and if 22% of children live in poor households (16 million children), this implies a huge drain on the productive capacity of the American economy. Education, health, and inclusion are important components of economic growth; and each of these is harmed by the persistence of poverty. So economists ought to be in the lead when it comes to placing a priority on poverty research.
We need to have a much more systematic understanding of the institutions and structures through which access to income and the necessities of life is created. And this implies that the mainstream might be well advised to take counsel from structuralist economists like Lance Taylor. Here is how Taylor describes the intellectual foundations of structuralist macroeconomics in Reconstructing Macroeconomics: Structuralist Proposals and Critiques of the Mainstream:
In the North Atlantic literature, structuralism's intellectual foundations lie within a complex described by labels such as [original, neo-, post-]-[Keynesian, Kaleckian, Ricardian, Marxian] which nonmainstream economists have adopted; numerous variants exist in developing countries as well. The fundamental assumption of all these schools is that an economy's institutions and distributional relationships across its productive sectors and social groups play essential roles in determining its macro behavior. (1)This emphasis on study of the concrete institutions embodied in a given economy, and the distributive characteristics that these create, seems like a very good starting point for arriving at a better understanding of the economic foundations of poverty than we currently have.