The Center for American Progress has issued a report in Q&A format on Social Security's disability programs. Here are a few somewhat random excerpts:
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Controlling just for income, participation in Supplemental Security by working-age adults who are potentially eligible because of low income has actually declined over the past decade and a half. In 2011 there were 17.6 nonelderly adults receiving Supplemental Security for every 100 nonelderly adults with incomes below 100 percent of the poverty line, compared to 18.5 nonelderly adults in 1996. In other words, the number of nonelderly adults receiving Supplemental Security grew at a slower rate than the number of nonelderly adults with very low incomes. ...
How does the United States compare with other countries?
According to a recent analysis by the Organisation for Economic Co-operation and Development, or OECD, the United States has the least generous disability-benefit system of all OECD member countries except Korea.