Opinion | Tariff Man Has Become Deficit Man – by Paul Krugman – The New York Times

“Beyond that, however, Trump is completely wrong about what causes trade deficits in the first place. In fact, his own policies have provided an object lesson in the falsity of his vision.

In the Trumpian universe, trade deficits happen because we made bad deals — we let foreigners sell their stuff here, but they won’t let us sell our stuff there. So the solution is to throw up barriers to foreign products. “I am a Tariff Man,” he proudly proclaimed.

The reality, however, is that trade deficits have almost nothing to do with tariffs or other restrictions on trade. The overall trade deficit is always equal to the difference between domestic investment spending and domestic saving (both private and public). That’s just accounting.

The reason America runs persistent trade deficits isn’t that we’ve given away too much in trade deals, it’s that we have low savings compared with other countries.”