John Maynard Keynes · Economics
Keynes’s unsettling discovery that saving - the great private virtue - can become a public vice, and that one person’s spending is another’s job.
Thrift is the oldest economic virtue - save for a rainy day, live within your means, and you prosper. For an individual, this is sound. But Keynes uncovered a disturbing paradox: when everyone tries to save more at the same time, especially in a downturn, the result can be that society as a whole grows poorer, and may even end up saving less than before. The private virtue, practised by all at once, becomes a public vice.
The same logic works in reverse, and powerfully - this is the multiplier. Suppose new spending enters the economy: a builder is paid to construct a road. The builder spends part of that income at the baker; the baker spends part at the butcher; the butcher spends part at the tailor. Each pound of original spending circulates, becoming income again and again, generating several pounds of total economic activity before it leaks away into savings or imports. So an initial injection of spending produces a magnified effect on total output - and, in a slump, a withdrawal of spending produces a magnified contraction. Spending echoes.
Beneath the paradox of thrift lies a deceptively simple accounting fact with explosive consequences: in any economy, total saving must end up equal to total investment. They are two sides of one ledger - the portion of income not consumed (saving) is, by definition, the portion available to be used for investment (building factories, houses, machines, inventories). The classical economists took comfort in this identity, reasoning that since saving equals investment, any money saved must automatically become money invested, so saving could never depress the economy - it merely transferred spending from consumption goods to investment goods. Keynes’s devastating insight was to notice the hidden flaw in this comfort: saving and investment are done by different people, for different reasons, on the basis of different expectations. Households decide how much to save based on their incomes and their desire for security; firms decide how much to invest based on their expectations of future profit and their confidence about an uncertain future. There is no mechanism guaranteeing that the amount households want to save at full employment will equal the amount firms want to invest.
So what happens when the two diverge - when people want to save more than businesses want to invest? The classical answer was that the interest rate would adjust to bring them into line. Keynes’s answer was far more unsettling: it is not the interest rate that adjusts, but income itself. If households try to save more than firms wish to invest, the extra saving means less consumption spending, so businesses sell less, earn less, and cut production and employment; incomes fall throughout the economy; and as incomes fall, people are forced to save less (you cannot save much from a shrinking income). The economy keeps contracting until total saving has been driven back down to equal the (low) level of investment - but this equality is now achieved at a lower level of income and output, with workers and factories left idle. Saving and investment are brought into balance not by the interest rate gently adjusting at full employment, but by the brutal mechanism of a recession shrinking incomes until reluctant saving falls to meet depressed investment. This is the precise machinery beneath the paradox of thrift: the attempt to save more, when investment does not rise to absorb it, does not enrich the nation but impoverishes it, because the adjustment falls on output and jobs rather than on interest rates. The gap between what savers want to save and what investors want to invest is closed by a slump.
This is the opening of the lesson. The rest — the dialogue, the primary source, and the recall — is in the app.
You learned that saving can backfire in aggregate and that spending multiplies. Explain the paradox of thrift and how the multiplier works, in your own words.
Leads to Hyman Minsky.
Begin this lesson →epoché — a humanities education that remembers you.