One cannot say with any certainty whether the more important cause of the current housing crisis was affordable-housing mandates or the actions of investment banks and ratings agencies. There can be no doubt, however, that both contributed. With that in mind, the best way to make sure that we don’t repeat our mistakes is to examine — and change — both… If the Community Reinvestment Act must stay in force, then regulators should take loan performance, not just the number of loans made, into account. We have seen the dangers of too much money chasing risky borrowers.