How the U.S. Department of Treasury came up with the “$700 billion” in the $700 billion TARP bailout.

“Seven hundred billion was a number out of the air,” Kashkari recalls, wheeling toward the hex nuts and the bolts. “It was a political calculus. I said, ‘We don’t know how much is enough. We need as much as we can get [from Congress]. What about a trillion?’ ‘No way,’ Hank shook his head. I said, ‘Okay, what about 700 billion?’ We didn’t know if it would work. We had to project confidence, hold up the world. We couldn’t admit how scared we were, or how uncertain.”