The financial institutions played a high-risk game in 2004–2007 thinking it was a low-risk game, all because their assumptions on losses and volatility were too low. We’d be watching an entirely different picture if only they’d said, “This stuff is potentially risky. Since home prices have gone up so much and mortgages have been available so easily, there just might be widespread declines in home prices this time. So we’re only going to lever up half as much as past performance might suggest.”
