Deflation's Problems Mirror Inflation's, and Deserve the Same List

Everyone knows inflation is a problem. Ask why and most people can produce two or three reasons without difficulty.

Ask the same about deflation and the answers get vague — something about a spiral, something about Japan. Yet deflation's problems are largely a mirror image of inflation's, and setting them out side by side makes both easier to think about. This is a first pass at that list.

Prices Change

The most basic cost, and identical under both regimes.

Prices carry information about relative scarcity. When the general price level is moving, every individual price becomes harder to read: you cannot tell whether a rise reflects genuine scarcity in that good or the drift of the whole level. The instability itself is the cost, independent of direction, because it degrades the signal every economic decision depends on.

The Value of Money Held

Here the mirror is exact and the asymmetry in public attention is striking.

Under inflation, money held loses value. This is a tax in disguise, and an unlegislated one: it transfers purchasing power from holders of currency to the issuer, without anyone voting for it.

Under deflation, money held gains value. This sounds pleasant and is the reason deflation gets less scrutiny. But it is equally a transfer — toward those who hold cash and away from everyone else — and it is no more legislated than the first.

Debt

The mirror again, and this is where the real damage lives.

Under inflation, the real value of debt shrinks. The borrower repays in cheaper money than he borrowed, which is why lenders charge interest to compensate.

Under deflation, the real value of what you owe grows continuously. You borrowed a sum representing a certain quantity of goods; you repay a sum representing more. Nobody agreed to this and no interest rate compensates for it, because it was not anticipated when the loan was written.

This is why deflation is dangerous in ways inflation is not. A heavily indebted economy under deflation faces a debt burden that increases without anyone borrowing another unit — and the natural response, paying down debt, reduces spending, which deepens the deflation.

Cascade Effects

Both regimes cascade, in opposite directions.

Inflation cascades through anticipation. Producers cannot predict input costs, so they build in margins. Those margins are other producers' input costs, so those producers build in margins. At five, seven, ten per cent it becomes self-reinforcing: everyone raising prices because they expect everyone to raise prices.

Deflation cascades through delay. Inflation pushes people to buy now, before prices rise. Deflation pushes them to wait, because the same money buys more next month. Deferred purchasing makes suppliers wary; they cut output and shelve expansion. That slows the economy further, and a slower economy strengthens the deflation.

There is an irony worth noting: reduced production does eventually push prices back up, so the mechanism is in principle self-limiting. But the route it takes is destructive — producers become afraid to produce, and the correction arrives through contraction rather than through anything anyone would choose.

Why the Asymmetry in Attention

If the problems mirror each other, why is inflation the one everybody discusses?

Partly recent experience: the twentieth century supplied vivid inflation episodes and few deflationary ones. Partly that inflation's costs are visible daily at the till, while deflation's costs are diffuse and show up as things that fail to happen.

And partly, I suspect, because deflation's most obvious effect — money becoming worth more — sounds like good news, and it takes a step of reasoning to see what it does to a borrower. Most people have not taken that step, so the danger stays invisible.

This is a first pass and I want to make it precise. Corrections welcome.