A person with one bee sting is highly motivated to get it treated. But a person with multiple bee stings does not have much incentive to get one sting treated, because the others will still throb. The more of a painful or undesirable thing one has (i.e. the poorer one is) the less likely one is to do anything about any one problem. Poverty is less a matter of having few goods than having lots of problems.
Poverty and wealth, by this logic, don’t just fall along a continuum the way hot and cold or short and tall do. They are instead fundamentally different experiences, each working on the human psyche in its own way. At some point between the two, people stop thinking in terms of goods and start thinking in terms of problems, and that shift has enormous consequences.

Charles Karelis, author of “The Persistence of Poverty: Why the Economics of the Well-Off Can’t Help the Poor,” philosopher and former president of Colgate University as quoted in the Boston Globe article, ”The Sting of Poverty”