While the risk of a disorderly crisis in the eurozone is well recognized, a more sanguine view of the United States has prevailed. For the last three years, the consensus has been that the U.S. economy was on the verge of a robust and self-sustaining recovery that would restore above-potential growth. That turned out to be wrong, as a painful process of balance-sheet deleveraging—reflecting excessive private-sector debt, and then its carryover to the public sector—implies that the recovery will remain, at best, below-trend for many years to come.