What Is Inflation? A Plain-English Guide to Why Money Loses Value

Most people think of risk as something that happens when you invest: stock prices fall, a company goes bankrupt, a currency collapses. But there is a quieter risk that affects everyone, including people who have never invested a cent. That risk is inflation. This guide explains in plain words what inflation is, how it is measured, what it does to your savings and how to compare your returns against it.

What is inflation, in plain words

Inflation is a sustained rise in the general level of prices for goods and services. Put simply: over time, the same amount of money buys less. A 100 note still says "100" on it, but the basket of groceries it paid for a year ago now costs more.

An example. If a loaf of bread cost 2.00 last year and costs 2.20 this year, its price has risen by 10 %. Your 2.00 no longer buys a whole loaf. When that happens to most goods and services at once, economists call it inflation.

A few points worth keeping straight:

• Inflation is about the general price level. One item getting more expensive, such as fuel or coffee, is not inflation on its own. Inflation means the average basket of spending costs more.
• Inflation is about purchasing power. The balance in your account may not change, but it buys less and less.
• The opposite is deflation, a sustained fall in the general price level. It is rare, and it causes its own problems for an economy.

Low and predictable inflation is considered normal for a growing economy. Many central banks in advanced economies, including the US Federal Reserve and the European Central Bank, aim for inflation of about 2 % a year. Inflation becomes a problem when it is high or unpredictable: it erodes savings and makes any long-term plan harder.

How inflation is measured

The main measure is the consumer price index (CPI). Statisticians record, every month, the prices of a basket of goods and services that households typically buy: food, clothing, housing and utilities, transport, healthcare, communications and so on. The change in the cost of that basket is the inflation rate. National statistics offices publish CPI, and central banks use it as the main guide for monetary policy.

Inflation figures come in several forms, so it helps to know which one you are looking at:

• Annual (year-on-year) inflation compares prices with the same month a year earlier. This is the number most headlines quote.
• Monthly inflation is the change over a single month. It can even be negative, for example when seasonal food prices fall.
• Core inflation strips out the most volatile items, such as fresh food and energy, or regulated prices, depending on the country. It shows the underlying price pressure better than the headline figure.

Your personal inflation rate

CPI describes an average household. Your own basket may rise faster or slower: if you drive a lot, fuel prices hit you harder; if you rent, rent is what matters most. The official figure is a guide, not an exact measure of how your own costs have changed.

Hidden inflation and shrinkflation

People often call it hidden inflation when the shelf price stays the same but you get less: a smaller pack (900 g instead of 1 kg), cheaper ingredients or worse service. This is known as shrinkflation. It is the same price rise in a less visible form. Statisticians try to adjust for changes in size and quality, but shoppers tend to notice this kind of inflation later than an ordinary price rise.

Why inflation happens

There is no single cause. Economists point to several mechanisms, which often work at the same time.

Demand-pull inflation

When total demand for goods and services exceeds what the economy can supply, prices rise. This can happen in a boom, when wages grow and people spend more, or when a government pumps large sums into the economy.

Cost-push inflation

When production gets more expensive, because of energy, fuel or raw material prices or disrupted supply chains, businesses pass the costs on to customers. Energy shocks and war are classic triggers.

Monetary inflation

When the amount of money in an economy grows faster than the output of goods and services, more money chases the same goods and prices rise. This is why "printing money" is associated with inflation, and why central bank independence matters.

Expectations

If businesses and households expect prices to rise, they act on it: workers ask for higher wages, companies raise prices in advance, and the expectation fulfils itself. That is why central banks work hard to "anchor" expectations, convincing people that inflation will return to target.

Inflation in practice: a recent example from Ukraine

Low single-digit inflation can make the topic feel abstract. Economies where inflation runs higher show its effects more clearly. Ukraine is one such example, and its official data illustrate how inflation, interest rates and savings interact.

Ukraine in 2026: the numbers

As of 20 October 2026, the latest official figures were (sources: the State Statistics Service of Ukraine and the National Bank of Ukraine, NBU):

According to the NBU's comment of 12 October 2026 (in Ukrainian), inflation accelerated to 10.0 % year on year in September, driven mainly by Russian attacks on production, storage and logistics infrastructure and by higher fuel prices. To contain it, the NBU raised its key policy rate from 15 % in the first half of the year to 15.5 % in July and 16 % in September. A higher policy rate makes saving in the local currency more attractive and borrowing more expensive, which cools demand and prices.

The NBU targets inflation of 5 % a year over a three-year policy horizon and, in its July 2026 forecast, expected to reach it at the end of 2028. Its next policy meeting is on 29 October 2026, with an updated forecast the same day, so these figures may soon be out of date.

When inflation gets out of control

Ukraine's history also shows the extreme cases. In 1993, during the hyperinflation that followed the collapse of the Soviet Union, consumer prices rose more than a hundredfold in a single year, according to the State Statistics Service. More recently, war-related shocks pushed annual inflation to 43.3 % in 2015 and 26.6 % in 2022 (December on December). Multiplying the annual rates for 2014–2025 shows prices rising about 4.9 times over those 12 years: 100,000 hryvnias kept in cash at the end of 2013 bought, by the end of 2025, roughly what 20,600 hryvnias bought in 2013.

Advanced economies are not immune either. In 2022, annual inflation peaked above 9 % in both the United States and the euro area, the highest in decades.

Why money loses value: inflation as a hidden tax

Inflation is often called a hidden tax: it reduces the value of money without any visible deduction. You get no bill and no notice. Your balance may stay the same or even grow a little with interest, but if inflation outpaces that interest, you are getting poorer.

Nominal vs real return

This is the most important distinction for any saver or investor:

• Nominal return is how much your money grows in currency terms.
• Real return is how much your purchasing power grows, that is, the return adjusted for inflation.

For small numbers, real return is roughly nominal return minus inflation. The precise formula is (1 + nominal return) ÷ (1 + inflation) − 1. What matters for comparisons is the return after tax, because interest is taxed in many countries.

A simple illustration: a savings account pays 4 %, interest is taxed at 25 %, and inflation is 3 %. After tax you earn 3 %, so your real return is about zero. The balance grows, but its purchasing power stands still.

The Ukrainian example shows the same arithmetic at higher numbers. On 19 October 2026 the Ukrainian index of 12-month hryvnia deposit rates (UIRD) stood at 13.94 %. Interest there is taxed at 23 % in total (18 % personal income tax plus a 5 % military levy), leaving about 10.73 %. If inflation stays at 10 % over the next 12 months, the real return is close to +0.7 %: the money barely keeps its purchasing power. This is an illustration, not a forecast or a bank offer.

The rule of 72: how fast inflation halves your money

The rule of 72 is usually used to estimate how long it takes money to double. It also works for inflation: divide 72 by the annual inflation rate to get the approximate number of years it takes for money to lose half of its purchasing power.

• At 2 % inflation: 72 ÷ 2 ≈ 36 years
• At 5 % inflation: 72 ÷ 5 ≈ 14 years
• At 10 % inflation: 72 ÷ 10 ≈ 7 years

At 43.3 % inflation, as in Ukraine in 2015, cash lost half its purchasing power in less than two years. You can run the numbers for your own amount and time frame in the inflation impact calculator.

Cash under the mattress: the illusion of safety

Keeping cash at home, or in a non-interest-bearing account, feels safe: "If I can see my money, nothing can happen to it." Against inflation, that feeling is misleading.

• Cash earns nothing. Money in a drawer earns zero, while inflation reduces its value every day.
• Strong currencies inflate too. Holding dollars or euros protects against a weak local currency, but not against inflation in the US or the euro area.
• Physical risks. Cash at home can be stolen or destroyed, and nobody will compensate you.
• Opportunity cost. Every idle unit of money could be earning interest or dividends. Over decades, the gap becomes enormous, as compound interest shows.

A modest cash reserve for emergencies makes sense. The problem is large sums sitting idle for years.

How to protect your savings from inflation

The goal is a positive real return: a return after tax that beats inflation. No instrument guarantees this, and each comes with its own risks.

Savings accounts and deposits

Deposits are simple and, within the limits of a deposit guarantee scheme, protected against a bank failure. Their rates often track the central bank's policy rate, so in some periods they keep pace with inflation and in others they fall behind. Always compare the rate after tax with inflation. The deposit vs investment calculator lets you compare the two on your own numbers.

Government bonds

Government bonds pay a fixed or floating rate set by the market, and their yields usually reflect expected inflation. Some governments also issue inflation-linked bonds, such as US Treasury Inflation-Protected Securities (TIPS), whose principal is adjusted for inflation. Rules and taxes differ by country: in Ukraine, for example, interest on government bonds (OVDP) is exempt from personal income tax and the military levy as of October 2026. Learn more in What Are Bonds.

Stocks and equity funds

Historically, stocks have been one of the most effective long-term ways to outpace inflation: companies can raise prices along with inflation, so their revenues and profits tend to grow over time. In the short term, though, stocks swing widely and can stay below their earlier value for years. Risk and Return explains how the two relate.

Real assets

Real estate, commodities and other tangible assets often rise in price along with the general price level. They usually need substantial capital, can be hard to sell quickly and carry their own risks.

Diversification

No single instrument protects against inflation in every environment. A mix of a cash reserve, deposits, bonds and stocks that fits your goals and time frame is usually more robust than betting on one of them.

What you can do now

• Think in real terms. From any offered return, subtract tax and expected inflation before deciding whether it is good.
• Separate your reserve from your savings. Emergency money should stay accessible; the rest can work over a longer horizon.
• Mind your time horizon. Inflation's damage compounds: over five or ten years, cash will fall noticeably short of a goal. The compound interest calculator shows what it takes to stay ahead.
• Follow the data. Statistics offices publish inflation monthly, and central banks announce rate decisions on a schedule. Deposit and bond rates follow them.

This article is for education only and is not financial advice.

Summary

In plain words, inflation is the rise in prices that makes money buy less over time. At 10 % a year, as in Ukraine in September 2026, cash loses half its purchasing power in about seven years; even at 2–3 %, the loss adds up over a working life. So the key question for any savings is not "what rate am I offered?" but "what is my real return after tax and inflation?". Check it on your own numbers, keep your emergency reserve accessible, and invest money for long-term goals such as financial independence in a way that has a chance to outpace inflation at a level of risk you are comfortable with.