Predict which kinds of price rise a rate rise will not touch.
A central bank raises its interest rate to slow prices down. What does the rate actually touch first?
Yes.It is a price on credit, and everything else follows from people responding to that price. Nothing about a shop's costs changes on the day of the announcement.
Not quite.Those move at the end of the chain, usually a year or more later. That lag is the hardest thing about the tool.
Not quite.Existing deposits are untouched. The rate works on the flow of NEW borrowing, not the stock of old money.
Put the chain in order: how a rate rise reaches the price of a coffee.
Every arrow is a human decision, which is why the lag runs to a year or more.Yes.Four links, each one a decision made by somebody who does not work for the central bank. That is why the effect is slow, uneven, and never certain.
The rate goes up today. Slide forward in time and watch where it has actually landed.
0 months6 months12 months24 months
2 of 20 · prices in the economy that have responded
0 monthsMortgage quotes and business loans reprice within days. Nothing else has moved.
6 of 20 · prices in the economy that have responded
6 monthsHouse sales slow, big purchases are delayed. Shop prices are still rising at the old speed.
13 of 20 · prices in the economy that have responded
12 monthsHiring cools, wage settlements come in lower, and the price rises begin to ease.
18 of 20 · prices in the economy that have responded
24 monthsMost of the effect has arrived — long after the conditions that caused the rise have changed.
Why is that lag the hardest part of the job?
Yes.By the time the effect lands, the shock that prompted it may be over — so a rate set for last year's problem can arrive in the middle of this year's.
Not quite.Impatience is real and it is a political problem, not a mechanical one. The lag would be just as hard if everyone were calm.
Not quite.They can move in a single meeting, and have moved several points in a year. It is the RESPONSE that is slow, not the lever.
Move the control to see what changes.
Which of these price rises can a rate rise actually work on?
House prices bid up by cheap mortgages.
Restaurant meals in a spending boom.
Wheat, after a drought halves the harvest.
Gas, after a pipeline is cut.
Car prices when everyone is buying on finance.
Yes.The tool works on DEMAND — on how much people are willing and able to buy. A shortage is a fact about supply, and raising the price of credit does not grow wheat.
A rate rise cools demand. When prices are rising because something is genuinely missing, the tool can only make people too poor to bid for it.
Prices are rising because a war has doubled the price of gas. The central bank raises rates hard anyway. What is the most likely result?
Yes.The rate cannot reach the cause, so it works on everything it CAN reach. That is a real choice with real costs, and it is why supply shocks split economists so sharply.
Not quite.The price is set by how much gas there is. No interest rate has ever moved a pipeline.
Not quite.Plenty happens — to borrowing, to hiring, to house prices. Just not to the thing that started it.
A central bank says its target is 2%, not 0%. Why aim for prices that still rise?
Yes.Deflation is the worse failure: purchases get postponed, debts get heavier in real terms, and the usual tool — cutting rates — runs out of room at zero.
Not quite.Neither is easy, and the misses have been large in both directions. The target is chosen for what it protects against, not for how hittable it is.
Not quite.Inflation does erode fixed debts, and governments are the largest fixed debtors. But the 2% target predates most of today's debt and is set by institutions kept at arm's length for exactly this reason.
Lesson complete
A rate rise works on demand. A shortage is not demand.