It’s true that we’d have more jobs if we exported more and imported less. But the same is true of Europe and Japan, which also have depressed economies. And we can’t all export more while importing less, unless we can find another planet to sell to.
What makes this funny is that Krugman wrote a paper on interstellar trade. http://en.wikipedia.org/wiki/The_Theory_of_Interstellar_Trade http://improbable.com/ig/winners/