Engine of our economy is….what?

rdan

This piece of stormy’s post caught my attention:

But ask yourselves–ask Krugman, ask Roubini, ask Martin Feldstein, ask any economist: What will be the engine of our economic recovery? The stimulus package can, at best, only blunt the worst effects of this economic crisis. And, the most overt forms of protectionism may come into play.

At the end of the tunnel, what will be the engine of our economy?

Lifted from Legal-protectionism-new-mercantilism.