EXCERPT:
"Quick. What’s the trade deficit between California and the rest of the world? Don’t try Googling it because you won’t find an answer. No government agency—or private entity—computes the dollar value of goods that people in the rest of the world sell to or buy from Californians. Why not? Because it doesn’t matter.
Yet governments do that computation for countries. Do trade deficits between countries matter? They do, but a lot less than most people think. A high trade deficit is not a definite sign of an economy’s weakness, and a low trade deficit or high trade surplus is not a definite sign of an economy’s strength....