Perverse incentives

The lead in to an article by Nicholas Kristof in the NYT:

This is what poverty sometimes looks like in America: parents here in Appalachian hill country pulling their children out of literacy classes. Moms and dads fear that if kids learn to read, they are less likely to qualify for a monthly check for having an intellectual disability.

Note also how things have changed:

About four decades ago, most of the children S.S.I. covered had severe physical handicaps or mental retardation that made it difficult for parents to hold jobs — about 1 percent of all poor children. But now 55 percent of the disabilities it covers are fuzzier intellectual disabilities short of mental retardation, where the diagnosis is less clear-cut.

There's a need for support fo some kind but it's tough to structure such programs well.