It is hard to imagine any time in history when such rampant pessimism about the economy has existed with so little evidence of serious trouble.

True, retail sales fell 0.4% in December and fourth-quarter real GDP probably grew at only a 1.5% annual rate. It is also true that in the past six months manufacturing production has been flat, new orders for durable goods have fallen at a 0.8% annual rate, and unemployment blipped up to 5%. Soft data for sure, but nowhere near the end of the world.

It...