THE steps being taken by government officials to help the economy are based on a faulty premise. The diagnosis is that the economy is “constrained” by a deficiency of aggregate demand, the total demand for American goods and services. The officials’ prescription is to stimulate that demand, for as long as it takes, to facilitate the recovery of an otherwise undamaged economy  as if the task were to help an uninjured skater get up after a bad fall.

The prescription will fail because the diagnosis is wrong. There are no symptoms of deficient demand, like deflation, and no signs of anything like a huge liquidity shortage that could cause a deficiency. Rather, our economy is damaged by deep structural faults that no stimulus package will address  our skater has broken some bones and needs real attention.

The good news is that some of the damage done in the past decade will heal. The pessimism that broke out in 2009 is dissipating. The oversupply of houses and office space, which is depressing construction, will wear off. Banks and households are saving quickly enough to retire most of their excessive debt within a decade.

But other problems are not self-healing. In established businesses, short-termism has become rampant. Executives avoid farsighted projects, no matter how promising, out of a concern that lower short-term profits will cause share prices to drop. Mutual fund managers threaten to dump shares of companies that miss quarterly earnings targets. Timid and complacent, our big companies are showing the same tendencies that turned traditional utilities into dinosaurs.