I read an adjective describing a noun, not a combined two word, self-defined phrase?

Perverse: inexplicably irrational: contrary to what is regarded as normal or reasonable, often for reasons that seem unaccountable or self-defeating

Incentive: something that encourages somebody to action: something that encourages or motivates somebody to do something.

Please, all knowledgeable one, tell me where you learned of this definition of "perverse incentive" (one word?).