In hindsight one of the worst things about America's subprime housing bust is how predictable it was. Subprime borrowers were by definition people of limited means with poor credit histories. Yet economists who have looked at the pattern of payments on subprime mortgages point out that even when house prices topped out and then began to fall, not all subprime borrowers defaulted. Only a minority of borrowers abruptly ceased to make payments, as someone choosing to default would.
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