Six years have passed since the United States economy entered the Great Recession, four and a half since it officially began to recover, but long-term unemployment remains disastrously high. And Republicans have a theory about why this is happening. Their theory is, as it happens, completely wrong. But they’re sticking to it — and as a result, 1.3 million American workers, many of them in desperate financial straits, are set to lose unemployment benefits at the end of December.

Merry Christmas.

Now, the G.O.P.’s desire to punish the unemployed doesn’t arise solely from bad economics; it’s part of a general pattern of afflicting the afflicted while comforting the comfortable (no to food stamps, yes to farm subsidies). But ideas do matter — as John Maynard Keynes famously wrote, they are “dangerous for good or evil.” And the case of unemployment benefits is an especially clear example of superficially plausible but wrong economic ideas being dangerous for evil.

Here’s the world as many Republicans see it: Unemployment insurance, which generally pays eligible workers between 40 and 50 percent of their previous pay, reduces the incentive to search for a new job. As a result, the story goes, workers stay unemployed longer. In particular, it’s claimed that the Emergency Unemployment Compensation program, which lets workers collect benefits beyond the usual limit of 26 weeks, explains why there are four million long-term unemployed workers in America today, up from just one million in 2007.

Correspondingly, the G.O.P. answer to the problem of long-term unemployment is to increase the pain of the long-term unemployed: Cut off their benefits, and they’ll go out and find jobs. How, exactly, will they find jobs when there are three times as many job-seekers as job vacancies? Details, details.