Job turnover

From Arnold Kling:

[Tyle Cowen:] In a highly specialized modern economy, it is much easier to prevent jobs from being destroyed than to create them again, at least assuming those are "good" jobs in the first place.

... in an ordinary non-recession month 4 million jobs are destroyed and about 4.2 million jobs are created. Suppose that in a bad month of a recession, 4.0 million jobs are created and 4.5 million jobs are destroyed. Which of those 4.5 million jobs ought to be saved, because they might come back in a stronger economy? No one in Washington knows.