For $68 billion, you could fly everybody in San Francisco to Los Angeles, and everybody in Los Angeles to San Francisco, and back again, about forty times. And that's before it starts going over budget.

But of course, the line doesn't go from Los Angeles to San Francisco. It goes from Burbank to Merced, on the good-governance principle that if you build something completely freaking useless, then somebody might find another hundred billion dollars to turn it into something useful at some point in the indeterminate future.