Krugman adds it up.

Money quote:

These aren’t paper losses like the wealth lost when the dot-com or housing bubble collapsed, wealth that was never real in the first place. We’re talking here about valuable products that could and should have been manufactured but weren’t, wages and profits that could and should have been earned but never materialized. And that’s $5 trillion, or $7 trillion, or maybe even more that we’ll never get back.