secular stagnation

An ordinary recession is a slump you recover from. But what if an economy got stuck in a low gear for years or decades — sluggish growth, weak investment, stubbornly low interest rates, and demand that never quite catches up to capacity, not because of one bad shock but as a chronic condition? That worrying possibility is what economists mean by secular stagnation. Here 'secular' is the old economic sense of 'long-term' or 'persistent', not anything to do with religion.

The idea, first raised by Alvin Hansen in the 1930s and revived by Larry Summers after 2008, is that an economy can suffer from a chronic shortage of demand relative to its capacity to save and invest. The diagnosis runs like this: an aging population, slowing technological payoff, rising inequality (the rich save more), and cheaper capital goods can leave society wanting to save more than businesses want to invest. With too much desired saving chasing too little investment, the interest rate that would balance them can be very low — even below zero. But central banks struggle to push rates that low, so the economy settles into a persistent state of weak demand, low growth, and low inflation, never running hot enough to fully use its potential.

Secular stagnation matters because, if real, it changes the policy playbook: ordinary interest-rate cuts run out of room (hitting the zero lower bound), so the burden shifts to sustained government investment, measures to raise demand, or accepting higher inflation targets. But it is a genuinely contested hypothesis, not an established fact. Critics argue the apparent stagnation reflects temporary headwinds, mismeasured productivity, or policy mistakes rather than a permanent condition, and the strong growth and inflation of some later periods cast doubt on it. It is best understood as a serious diagnosis that economists actively debate, not a settled verdict.