How Money Really Works, Part 3: Why Prices Rise

Intro

Why prices rise: seven ways international organizations explain it, with what each one does to your money. In the median country, prices rose about 3% in twenty twenty-five, so the same money bought a little less. Part two showed how money is created. The last item answers what it leaves open: what keeps prices in check.

These points come from international organizations' own explainers, reports and data, linked in the description.

7. What inflation measures

Number seven: what inflation measures, a rate of change, not the price level itself. The IMF explains that inflation is the rate of increase in prices over a given period of time. It is most commonly measured over a year, the IMF explains. The IMF describes consumer price inflation as the percentage change in the consumer price index, or CPI.

The World Bank defines it as the annual percentage change in the cost to the average consumer. That cost is for acquiring a basket of goods and services. A simple comparison shows how the CPI rate works. Say the base year CPI is 100 and the current CPI is 110.

Then, in the IMF's example, inflation is 10% over the period. So the number you hear is simply a change between two readings of the same basket. The IMF adds that the basket is mostly kept constant for consistency. It is occasionally tweaked to reflect changing consumption patterns, the IMF explains.

That means the measure stays comparable over time while still following how people spend. Baskets and methods differ from place to place, so the figure where you live may look different. Today, you could find the latest inflation figure where you live and note which period it covers. You could also check whether it compares this year with last year or with another base year.

A single percentage then becomes easy to read, because you know what it measures. Next comes the first cause: what happens when demand runs ahead of supply. Subscribe, because next we explain the kind of price rise that starts with too much spending.

6. Too much spending

Number six: too much spending, which lifts prices only when demand outruns what can be produced. The IMF explains that demand can get a boost in more than one way. Demand shocks, such as a stock market rally, can boost demand, the IMF explains. So can expansionary policies, the IMF says, which cover a central bank lowering interest rates.

The IMF adds a second example: a government raising its spending. In both cases, more people and firms have more money to spend. Production capacity is the most that an economy can make with the resources it has. The IMF explains that if demand exceeds production capacity, demand-pull inflation can result.

Picture many buyers reaching for goods that sellers cannot make any faster than they already do. Rising prices are then the sign that buyers are competing for a limited supply. The name fits well, because demand is the force pulling prices upward in this picture. Spending alone is not the issue; the gap between demand and capacity is what the IMF highlights.

Think of it as a simple test: is spending growing faster than the ability to produce? That one question is a handy way to read the first cause on our list. Policies, spending habits and production capacity differ widely, so the picture where you live may look different. Today, you could read recent news on interest rates or public spending where you live.

You could also note whether the price changes you see look like buyers competing for scarce goods. Even so, prices can rise when demand is calm, and that is where rising costs come in.

5. Rising costs

Number five: rising costs, where prices can climb even when buyers want no more than before. The IMF explains that supply shocks can disrupt production, for example natural disasters that interrupt how goods are made. Supply shocks can also raise production costs, the IMF says, with high oil prices as its example. Either way, the IMF explains, the result can be what it calls cost-push inflation.

Here the push comes from the cost of making things, not from buyers wanting more of them. The BIS, the bank for central banks, reports a current example from energy. The BIS writes that inflation has risen and that the energy supply shock has been substantial. The BIS adds that the effects of that shock may propagate through supply chains.

The BIS also reports that prices of plastics and fertilisers, which are key inputs, have risen. In the BIS figures, plastics rose 30% and fertilisers 50%. Inputs matter because they feed into many finished goods that people buy in daily life. The key question, the BIS says, is whether these first price increases will broaden and persist.

A cost shock can stay narrow or spread across many prices. Sources of cost pressure, and how strongly they show up, differ widely from one place to another. Today, you could compare a few everyday prices from this month with the same items last month. You could also ask whether a rise is limited to one item or appears across many.

Costs and demand are only part of the story, because what people expect also moves prices.

4. Expectations

Number four: expectations, which can enter wages and contracts before prices even move. The IMF explains that if people or firms anticipate higher prices, that belief starts to matter. They then build expectations into wages and into contractual price adjustments, the IMF explains. That makes expectations partly self-fulfilling, the IMF says, and it adds to inflation inertia.

Put simply, a belief about tomorrow's prices can help bring those prices about. Inertia means inflation can keep going for a while once these habits are built into everyday agreements. The BIS warns that inflation expectations could lose their anchor more quickly than in the past. The BIS also says greater slack in the labour market may help to contain wage pressures.

Wages matter here because, as the IMF explains, expectations are built into them, alongside contracts. The BIS adds a hopeful point: credible monetary policy anchors inflation expectations. An anchored expectation is one that stays steady, instead of drifting with every new headline or rumour. So expectations can work in both directions, either feeding price rises or helping to calm them down.

How wages are set and how contracts adjust prices differ widely, so your own situation may differ. Today, you could check whether your own agreements, such as a rent or a service plan, mention yearly adjustments. You could also look at how that adjustment is described and which measure it is tied to, if any. Next, we look at the cause behind long-lasting high inflation: too much money.

We're halfway, and the next three parts add money, your money, and what keeps prices in check.

3. Too much money

Number three: too much money, which matters only compared with the size of the economy. Part two showed that money is created by banks and by central banks. Part two also showed that this creation has limits. Now we connect that idea to prices, which is the question of this video.

The IMF explains that long-lasting high inflation often results from lax monetary policy. In its words, if the money supply grows too big relative to the size of an economy, the currency's purchasing power falls. Put simply, when money grows faster than the economy, each unit buys a little less. Think of it as the same amount of goods being shared among more units of money.

Notice the word relative, because what matters is money compared with the size of the economy. The IMF ties this cause to long-lasting high inflation, not to a single month's jump. So money is one cause among the seven, and it works alongside demand, costs and expectations. How money is created, how fast it grows and how it is managed all differ where you live.

Today, you could look up whether published figures show money growing faster or slower than the economy. Next, we see what all these causes do to the buying power of your money. If you want the practical side, the video on protecting your money from inflation is linked on screen.

2. What it does to your money

Number two: your money, where a bigger pay figure can still buy less. The IMF explains that if nominal incomes do not increase as much as prices, purchasing power falls. Real income adjusts income for inflation, so it falls when prices rise faster than income. The IMF describes this erosion of real income as the single biggest cost of inflation.

The IMF gives an example of a pensioner who receives a fixed 5% yearly increase. That pensioner loses purchasing power if inflation is higher than 5%. World Bank data show the median country at 8% in twenty twenty-two and 3% in twenty twenty-five. By our count, at 3% a year, what cost 1,000 last year costs 1,030 now.

So 1,000 now buys about 970 of last year's prices. By our count, at 3% a year, prices double in about twenty-four years. That comes from the rule of seventy-two, where seventy-two divided by three gives twenty-four. Wages, pensions and price changes all differ where you live, so your own experience may vary.

Today, you could compare the last raise or pension change you received with the latest inflation rate where you live. In one breath: spending, costs, expectations and money push prices up, while buying power shows the result. Next comes the good news: what keeps prices in check, and how it protects your buying power.

1. What keeps prices in check

Number one: what keeps prices in check, credible central bank tools that can protect buying power. The IMF explains that central banks increasingly rely on influencing inflation expectations as a disinflation tool. The IMF adds that the credibility of the central bank enhances the influence of such announcements. The BIS says credible monetary policy anchors inflation expectations, which links back to Number four.

The BIS also says a firm commitment to price stability helps to anchor long-term interest rates. It adds that this commitment is underpinned by central bank independence, which gives the promise more weight. The IMF explains that if the economy is overheated, contractionary monetary policy can rein in aggregate demand. That answers Number six, where too much spending pulled prices up faster than production could follow.

The IMF also notes that some central banks impose monetary discipline by fixing the exchange rate. The IMF's July twenty twenty-six outlook update says global disinflation has stalled, meaning the fall in inflation has paused. So keeping prices in check is steady, ongoing work, and credible tools matter more than quick fixes. The IMF explains that lenders' real income suffers when inflation is not factored into nominal interest rates.

Someone who keeps savings in an account is lending to the bank, so this idea reaches savers. By our count, a savings rate of 4% with inflation at 3% leaves a real gain of about 1%. That count is approximate, and the real gap moves whenever either the rate or inflation changes. Central bank rules, targets and savings rates differ from place to place, so local numbers are what count.

Today, you could set your savings rate beside the latest inflation rate and look at the gap. A raise can be compared the same way. Now, a recap of all seven ideas.

Recap

Number seven, inflation: the yearly rise in prices, tracked by the CPI. Number six, too much spending: demand beyond capacity pulls prices up. Number five, rising costs: higher production costs push prices up. Number four, expectations: expected rises get built into wages and prices.

Number three, too much money: faster than the economy, each unit buys less. Number two, your money: when prices outrun income, real income falls. Number one, what keeps prices in check: credible central banks anchor expectations. Today, open the official inflation page where you live and compare its rate with your savings rate.

Which of the seven surprised you most? Tell us in the comments. Results vary, rules differ where you live, and this is information only, not financial advice. Next on Wealth Filings, watch part one, what money really is, linked on screen.

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