There is an optimistic scenario for the U.S. economy: Europe gets its act together. The pace of world growth quickens, igniting demand for U.S. exports. American politicians agree to a credible compromise that gives the economy a fiscal boost now and restrains deficits later. The housing market turns up. Relieved businesses hire. Relieved consumers spend.
But there are at least two unpleasant scenarios: One is that Europe becomes the epicenter of a financial earthquake on the scale of the crash of 1929 or Lehman Brothers 2008. The other is that Europe muddles through, but the U.S. stagnates for another five years, mired in slow growth, high unemployment and ugly politics.
No one would intentionally choose the second or third, yet policy makers look more likely to stumble into one of those holes than find a path to the happier ending.