Has the dollar lost value under Bernanke and Obama? No. The usual measure for the strength of the dollar is called “trade-weighted value.” In July 2008, just before the financial crisis erupted in earnest, the greenback’s value stood at 95.4. As I’m writing this in mid-September, it has gone up, then down, and is currently sitting at 96.1.Taking a longer view, the dollar lost value under Reagan and Bush I, gained value under Clinton, lost value under Bush II, and has mostly stayed steady under Obama. There’s just no basis to the claim that Obama and Bernanke have debased the currency.

And that’s unfortunate. As economist Dean Baker is fond of pointing out, if we want to get our national savings rate up and our long-term budget deficit down, there’s only one way to do it: by fixing our massive trade deficit. We have to import less and export more, and one way to make that happen is with a weaker dollar. A weaker dollar makes foreign goods more expensive, so we’ll buy less of them, and makes American goods cheaper, so others will buy more of them.

The truth is that we’d be better off if we ditched the loaded “strong/weak” terminology and just talked about an “export dollar” (weak) and an “import dollar” (strong). Sometimes one is good, and sometimes the other is. The Chinese, for example, have done well for decades with an export yuan. Likewise, an export dollar would be our friend right now.