What Does 'Uncertainty' Really Mean?

The recovery has turned blue with cold, and a lot of folks are blaming business uncertainty for freezing employers who might have hired if only ... well, if only what? Stan Collender calls BS on the uncertainty meme:

Pushing for the three changes the business community says are so important to the economic recovery -- keeping the current rate on upper income individuals and the existing rates on capital gains and dividends -- has nothing to do with certainty and everything to do with lowering taxes compared to what they would be under current law.