What’s behind this new pessimism? It partly reflects the troubles in Europe, which have less to do with government debt than you’ve heard; the real problem is that by creating the euro, Europe’s leaders imposed a single currency on economies that weren’t ready for such a move. But there are also warning signs at home, most recently Wednesday’s report on consumer prices, which showed a key measure of inflation falling below 1 percent, bringing it to a 44-year low.

This isn’t really surprising: you expect inflation to fall in the face of mass unemployment and excess capacity. But it is nonetheless really bad news. Low inflation, or worse yet deflation, tends to perpetuate an economic slump, because it encourages people to hoard cash rather than spend, which keeps the economy depressed, which leads to more deflation. That vicious circle isn’t hypothetical: just ask the Japanese, who entered a deflationary trap in the 1990s and, despite occasional episodes of growth, still can’t get out. And it could happen here.

So what we should really be asking right now isn’t whether we’re about to turn into Greece. We should, instead, be asking what we’re doing to avoid turning Japanese. And the answer is, nothing.