Fundamentals

What Inflation Is and Why It Destroys Purchasing Power

By Daniel Sardá · April 27, 2026

Inflation is the sustained increase in the general price level of goods and services in an economy over a given period. In simple terms: inflation occurs when money buys less and less.

It does not simply mean that one product became more expensive. If coffee becomes more expensive because of a bad harvest, that may be a specific price change. Inflation appears when prices as a whole tend to rise persistently and the currency’s purchasing power falls.

Understanding what inflation is matters because it affects daily life: wages, savings, rent, food, transportation, medicine, credit, contracts, investment and family planning.

From a liberal-libertarian perspective, inflation is not only a technical problem of prices. It is also a problem of property, money and political power. When a currency loses value, people may keep the same nominal amount, but they have less real control over their income, savings and future.

Inflation does not destroy banknotes. It destroys what those banknotes can buy.

What inflation is

Inflation is usually defined as a generalized and sustained increase in prices.

The Bank of Spain explains it as a general rise in the prices of goods and services, which means that the same amount of money can buy less. The OECD measures inflation through changes in the consumer price index.

The core idea has two sides:

These are two sides of the same phenomenon. If prices rise broadly, each monetary unit can buy fewer goods and services.

Simple definition

If a basket of food used to cost 100 monetary units and now costs 130, money has lost purchasing power against that basket.

If your income did not rise at the same pace, you are poorer in real terms, even if your nominal wage is unchanged.

Inflation is not every price increase

Not every price increase is inflation.

A specific price can rise for many reasons:

That may be serious, but it is not necessarily general inflation.

Relevant inflation appears when the rise spreads across goods and services and persists over time.

Why it means money buys less

Prices are the visible form of the problem. The loss of money’s value is the practical consequence.

If you have 100 monetary units and prices rise by 30%, you still have 100. But those 100 units buy less food, less transportation, fewer services, less rent or less future saving.

That is why inflation is best understood as a loss of purchasing power.

What purchasing power is

Purchasing power is the quantity of goods and services you can buy with a given amount of money.

The relevant issue is not only how much money you have in numerical terms. The relevant issue is what that money can buy.

Nominal money vs. real money

Nominal money is the number.

Real money is its buying capacity.

Example:

You did not lose monetary units. You lost real value.

Nominal wage vs. real wage

The nominal wage is the amount shown in the paycheck.

The real wage is what that wage can buy after inflation is taken into account.

Example:

A worker earns 100. Then he receives a 20% raise and now earns 120. That looks better.

But if prices rose by 40%, that worker lost purchasing power. His nominal wage rose, but his real wage fell.

In simple terms: a wage increase can conceal a real fall in income.

Nominal savings vs. real savings

Nominal savings are the amount saved.

Real savings are what those savings can buy.

A person may save 500 monetary units for several months. If inflation rises, that person still sees 500 in a bank account or in cash, but that money buys less.

This is why inflation especially punishes those who save in weak currency and lack access to assets, foreign currencies, indexed instruments or protection mechanisms.

How inflation is measured

Inflation is usually measured through price indices.

The best-known measure is the CPI, or consumer price index.

What the CPI is

The CPI measures the evolution of the price of a representative basket of goods and services consumed by households.

That basket may include food, housing, transportation, health care, education, communications, clothing, recreation and other components, depending on each country’s methodology.

The Bank of Spain explains that inflation is measured by observing how the price of a representative basket of household consumption goods and services changes. The OECD also summarizes frequently asked questions on consumer price indices, which are useful for understanding what a CPI does and does not measure.

What a consumption basket measures

A consumption basket tries to represent typical household spending.

But no real household consumes exactly like the statistical average.

A family with children, a retiree, a student, a shopkeeper, a rural worker and an urban professional may experience different inflation in practice because they spend on different things.

That is why the CPI is useful, but not perfect.

Monthly, year-on-year and cumulative inflation

Inflation can be expressed in several ways.

Monthly inflation: compares prices with the previous month.

Year-on-year inflation: compares prices with the same month in the previous year.

Cumulative inflation: adds the variation over a period, for example from January to December or over several years.

Cumulative inflation is key to understanding silent damage. An annual inflation rate that looks small can erode purchasing power significantly if it repeats year after year.

Core inflation

Core inflation tries to capture the underlying price trend by excluding highly volatile components.

Many methodologies exclude energy or unprocessed food, although the precise definition varies.

That does not mean those prices “do not matter.” They matter a great deal for families. But temporarily excluding them can help analysts distinguish specific shocks from persistent trends.

Limits of the CPI

The CPI should not be treated as an automatic lie or as a perfect description of every household.

It has limits:

The CPI measures consumer prices; it does not measure every asset price or necessarily the personal cost of living of every household.

The rigorous point is not to say “the CPI lies.” The rigorous point is this: the CPI measures average inflation under a methodology; each person may experience a different loss of purchasing power.

Do not confuse inflation, CPI, devaluation and specific price increases

Inflation is often mixed together with other concepts. They should be separated.

These phenomena can be connected, but they are not identical.

Why inflation destroys purchasing power

Inflation destroys purchasing power because prices rise earlier, faster or differently than people’s incomes and savings.

The same income buys less

If your wage stays the same while prices rise, your buying capacity falls.

You may reduce consumption, switch brands, buy lower quality, go into debt, use savings or stop buying certain goods.

Inflation forces changes in life decisions, not only in budgets.

Savings lose real value

Anyone who holds money in cash or in accounts that do not compensate for inflation loses purchasing power.

This especially punishes people with limited access to financial instruments, real assets or more stable currencies.

Not everyone can take refuge in real estate, stocks, foreign currency or indexed assets. Many people have only wages, cash and a basic account.

Prices change before wages

In many contexts, prices adjust faster than wages.

A merchant changes prices because inventory must be replaced at higher cost. A worker, by contrast, negotiates wages from time to time, if he can negotiate at all.

That lag hits the real wage.

Economic planning becomes harder

High inflation makes it harder to answer basic questions:

When money stops being a reliable reference point, planning becomes more costly.

Main causes of inflation

Inflation can have several causes and triggers. Simplistic explanations should be avoided.

Not every price increase begins in the same way. But sustained inflation always requires looking at money, production, expectations, fiscal policy and monetary institutions.

Demand-pull inflation

This occurs when total demand for goods and services grows faster than production capacity.

If many people and firms want to buy more, but supply cannot respond at the same pace, prices tend to rise.

This may be linked to cheap credit, public spending, monetary expansion, fiscal stimulus or rapid increases in nominal income.

Cost-push inflation

This occurs when important production costs rise.

Examples include:

If production becomes more expensive, many firms try to pass part of that cost on to final prices.

Supply shocks

A war, drought, pandemic, logistics shutdown or supply-chain disruption can reduce supply and raise prices.

That shock may trigger a price increase. But whether it becomes persistent inflation depends on expectations, monetary policy, fiscal policy, wages, credit and confidence.

Devaluation and imported inflation

Inflation and devaluation are not the same thing, but they can reinforce each other.

If a local currency depreciates against foreign currencies, imports become more expensive. That can raise the price of food, medicine, machinery, spare parts, fuel or inputs.

In economies that are highly dependent on imports, devaluation can pass through quickly into domestic prices.

Inflation expectations

If firms, workers and consumers expect future inflation, they adjust their behavior.

Businesses raise prices preemptively.

Workers demand raises.

Creditors demand higher rates.

Consumers bring purchases forward.

Contracts become indexed.

Expectations can turn an initial problem into a more persistent dynamic. The IMF has stressed the role of inflation expectations in monetary policy, precisely because households, firms and markets adjust decisions according to what they expect to happen to prices.

Monetary expansion and fiscal policy

Sustained inflation cannot be separated from monetary and fiscal policy.

The monetarist tradition argues that broad and persistent inflation requires monetary conditions that sustain it. The formulation should be used with nuance: there may be real short-term shocks, but general and durable inflation usually requires monetary, fiscal or institutional conditions that keep it alive.

If the state persistently spends more than it collects, it needs to finance the deficit. It can raise taxes, issue debt, cut spending, delay payments or resort to direct or indirect mechanisms of monetary issuance.

When the deficit is financed by creating money or weakening confidence in the currency, the cost can appear as inflation.

Central banks, fiat money and inflation

In modern systems, inflation is linked to the monetary framework.

That does not mean every inflationary episode is caused only by the central bank. But it does mean that central banks, fiat money and fiscal policy are central pieces for understanding inflation’s persistence.

What role a central bank plays

A central bank influences the currency, liquidity, interest rates, credit, bank reserves and expectations.

For more on this institution, see the article on what central banks are.

Modern central banks usually declare price stability objectives. The European Central Bank defines price stability as a central priority of its monetary policy.

But declaring an objective does not remove incentive problems, diagnostic errors, fiscal pressure, policy lags or political tensions.

What issuing money means

Issuing money does not only mean printing banknotes.

In the modern system, it can also mean expanding the monetary base, providing liquidity, buying assets, acquiring public debt, creating facilities for the financial system or enabling bank-credit expansion under certain conditions.

The relationship between issuance and inflation is not always immediate.

It may depend on:

But if monetary expansion persistently exceeds productive capacity and money demand, the probable result is a loss of purchasing power.

Why fiat money changes state incentives

Fiat money is money that is not directly convertible into a commodity such as gold or silver. Its value depends on social acceptance, legal tender rules, the banking system, the central bank, fiscal power and institutions.

For more on this issue, see the article on fiat money from a liberal-libertarian critique.

The liberal-libertarian concern is that fiat money increases the discretion of monetary power. If there is no strong external constraint or effective monetary competition, the state and central bank have more room to expand money, sustain debt, rescue sectors or finance spending in less visible ways.

That does not mean all fiat money automatically ends in hyperinflation. It means the institutional design creates incentives that must be watched with severity.

When issuance becomes inflationary

Monetary issuance becomes especially inflationary when it:

The problem is not only how many monetary units exist. It is what people believe about the future value of the currency and about the discipline of those who manage it.

Inflation as an indirect tax or hidden tax

Inflation is often called an “inflation tax.” That expression is useful, but it must be explained precisely.

It is not a formal legal tax like VAT, income tax or a tariff.

It is an economic analogy.

What seigniorage is

Seigniorage is the benefit the issuer of money obtains by creating currency whose production cost is lower than its purchasing power or face value.

In fiat systems, the issuer can create money and acquire goods, services or financial assets. If that expansion reduces the value of existing money, those who hold monetary balances lose purchasing power.

The IMF, in its guidelines on fiscal adjustment, treats seigniorage and the inflation tax as forms of financing linked to money creation and to the loss of purchasing power of monetary balances.

Why it is called an inflation tax

It is called an inflation tax because inflation reduces the real value of the money people already hold.

No tax bill arrives.

There is no visible rate.

There is no individual tax return.

But the economic effect can resemble a tax: part of the population’s purchasing power is transferred toward whoever issues the money first, finances spending or receives the new liquidity earlier.

To distinguish this analogy from formal taxes, it is useful to separate the inflation tax from taxes as legal instruments of revenue collection.

Differences from a formal tax

A formal tax is approved, declared, paid and usually has an explicit legal basis.

The inflation tax operates more diffusely. The person sees higher prices, lower real wages and eroded savings.

That is why it can be politically convenient: it allows spending to be financed or resources to be redistributed without openly saying “we raised taxes.”

Who pays the highest cost

Inflation does not affect everyone equally.

Those usually more exposed include:

Those usually better protected include:

This explains why inflation is also a distributive phenomenon.

Economic effects of inflation

Inflation does not only make life more expensive. It changes incentives, contracts, savings, relative prices and social behavior.

Distortion of relative prices

Prices communicate information.

They indicate scarcity, demand, costs, preferences and opportunities.

When inflation is high, not all prices rise at the same time or at the same pace. That makes it harder to distinguish whether a product rose in price because it is genuinely scarcer or because money is worth less.

The price signal becomes less clear.

Punishment of saving in weak currency

Saving in a currency that loses value is difficult.

If a person holds money for one year and inflation exceeds any return received, real savings fall.

This discourages productive saving and pushes people toward shelters: foreign currencies, durable goods, inventory, real estate, financial assets or consumption brought forward.

Redistribution between debtors and creditors

Inflation can benefit debtors with fixed debt in local currency, because they repay in the future with money of lower value.

But it harms creditors and savers who receive depreciated payments.

If inflation becomes expected, creditors respond: they demand higher rates, indexation, collateral or contracts in a more stable currency.

Contractual trust deteriorates.

Incentive to consume quickly

In high inflation, holding money can be costly.

People buy before prices rise. Firms advance inventory purchases. Merchants adjust prices preemptively.

This can accelerate the inflationary dynamic: everyone tries to escape a currency that is losing value.

Spontaneous dollarization and loss of monetary trust

When the local currency stops working well as a store of value, people seek alternatives.

They may start saving in dollars, setting rents in another currency, quoting durable goods in foreign currency or signing indexed contracts.

This does not always happen by decree. Often it happens spontaneously because people are protecting purchasing power.

Price controls, scarcity and parallel markets

Price controls try to stop the visible symptom: the price.

But if costs rise and the official price falls below replacement cost, problems appear:

Controlling the price does not eliminate the monetary, fiscal, productive or institutional causes of inflation. The Spanish-language case study on price controls in Venezuela is a useful reference for expanding this logic in a specific context, without making this article depend on that case.

Inflation and economic freedom

Inflation affects economic freedom because it reduces the real ability to use one’s income, savings and property.

It does not always confiscate directly. But it erodes value.

Less real control over one’s own money

A person may keep the same wage, bank account or cash.

But if everything buys less, effective control over resources falls.

In liberal terms, this matters because property is not only nominal title. It is also the real ability to use and dispose of what one owns.

Less ability to save and plan

Inflation punishes patience.

Saving becomes difficult. Signing long contracts becomes risky. Lending money requires higher premiums. Business planning requires more protection against price changes.

An economy with unstable money forces people to live more in the short term.

Greater dependence on centralized decisions

In modern monetary regimes, the value of money depends largely on decisions made by central banks, governments, regulators and financial systems.

That concentrates power.

When those institutions make mistakes, yield to fiscal pressure or lose credibility, the cost is spread across the entire population.

Greater state power to finance itself indirectly

If the state can finance part of its spending through direct or indirect issuance, it can temporarily avoid the political cost of raising explicit taxes.

The citizen does not see a new tax law. He sees higher prices.

From a liberal-libertarian perspective, this is especially problematic because it reduces fiscal transparency and weakens limits on political power.

Deterioration of contracts and economic calculation

High inflation makes contracts conflictive.

The landlord wants indexation. The tenant cannot pay. The worker demands an adjustment. The entrepreneur does not know how much inventory replacement will cost. The lender demands higher rates. The debtor tries to pay with depreciated currency.

Money stops being a reliable unit of account.

That damages economic cooperation.

The liberal-libertarian critique of inflation

The liberal-libertarian critique should not sound conspiratorial. It should focus on institutions, incentives and effects.

Classical liberalism: stable money, property and limits on fiscal power

Classical liberalism values private property, the rule of law, predictable contracts and limits on fiscal power.

An unstable currency weakens all of that.

If the state can finance itself by reducing the value of money, property becomes exposed to an indirect form of deterioration.

Monetary stability is not a technical luxury. It is a condition for saving, investing, contracting and planning.

Austrian economics: monetary expansion and economic calculation

The Austrian tradition emphasizes that monetary and credit expansion can distort prices, interest rates and investment decisions.

Ludwig von Mises developed part of that critique in The Theory of Money and Credit. From that tradition, money is not neutral in the way it enters the economy: new liquidity affects some sectors first and others later.

That reading helps explain why inflation does not affect everyone equally.

Public choice: political incentives to inflate

From public choice economics, the problem is not only technical. It is political.

Governments have incentives to spend today and shift costs into the future.

Raising explicit taxes is unpopular.

Cutting spending is also unpopular.

Issuing money, pressuring the central bank or keeping rates artificially low may look less politically costly at first, even if it later erodes the currency. This concern connects with the public choice tradition associated with authors such as James Buchanan and Gordon Tullock, whose work The Calculus of Consent analyzes how rules and political incentives shape collective decisions.

Libertarian critique of the state monopoly over money

The libertarian critique goes further: it questions whether the state should have a monopoly over money and impose legal tender, central banking and centralized monetary rules.

From that perspective, inflation is a symptom of a deeper institutional problem: the absence of monetary competition and strict limits on the issuer.

Not all economists accept that conclusion. But the question is relevant: if competition disciplines other goods and services, why should money remain under political monopoly?

Necessary objections and nuances

A good article on inflation must avoid exaggeration.

“Inflation can come from external shocks”

Yes.

Oil, food, wars, droughts, pandemics or logistical breakdowns can start price increases.

But persistence depends on expectations, monetary policy, fiscal policy, wages, credit, the exchange rate and institutional credibility.

A shock can ignite the problem. Economic policy can extinguish it or make it permanent.

“A little inflation helps avoid deflation”

Many central banks defend positive low-inflation targets to avoid persistent deflation and facilitate certain nominal adjustments.

The liberal response is that a positive inflation target also implies planned erosion of purchasing power.

The real debate is not between infinite inflation and destructive deflation. It is between which monetary regime best protects stability, savings, contracts and freedom.

“Central banks seek price stability”

It is true that many central banks declare that objective.

But mandates do not eliminate errors, lags, political pressure, fiscal dominance, wrong models or credibility problems.

The relevant question is not only what an institution says it wants. It is what incentives it faces, what limits constrain it and who bears the cost when it fails.

“Not every issuance generates immediate inflation”

Correct.

Money creation does not mechanically produce the same price effect in every context or at the same speed.

The effect depends on money demand, credit conditions, expectations, production, confidence in the currency and the financial system.

But this does not make monetary expansion irrelevant. It means its effects must be analyzed institutionally and over time.

“Inflation does not affect everyone equally”

Also correct.

Inflation can benefit some debtors, those who receive new money earlier or those who can adjust prices quickly.

But it tends to harm people with fixed income, slow wage adjustments, cash savings or weak access to protection instruments.

That is one reason inflation is so politically and socially sensitive.

How to think more clearly about inflation

This article is not an investment guide. But it does offer a conceptual way to avoid confusion.

Distinguish nominal figures from real figures

A wage, balance or revenue number means little if prices are changing quickly.

Always ask: what can that amount actually buy?

Evaluate wages, savings and investment in real terms

A nominal gain can still be a real loss.

A bank account can look unchanged while losing purchasing power.

An interest rate can be positive in nominal terms and negative after inflation.

Be skeptical of price controls as a permanent solution

Price controls may create a temporary political illusion.

But if they do not address monetary, fiscal, productive and institutional causes, they often produce scarcity, lower quality and parallel markets.

Observe fiscal and monetary discipline

Inflation is not only about supermarkets or daily prices.

It is also about budgets, deficits, debt, central banks, credibility, expectations and the institutional rules that govern money.

Frequently asked questions about inflation

What is inflation in simple words?

Inflation is when prices in the economy rise broadly and persistently, so the same amount of money buys fewer goods and services.

Why does inflation make money worth less?

Because each monetary unit can buy less than before. The number printed on the bill or shown in the account is the same, but its real buying capacity falls.

How is inflation measured?

Inflation is usually measured through price indices, especially the consumer price index, which tracks the price changes of a representative basket of household goods and services.

What is the CPI?

The CPI is a statistical indicator that measures the evolution of consumer prices. It is useful, but it represents an average and does not perfectly describe every household’s personal cost of living.

What is the difference between monthly, annual and cumulative inflation?

Monthly inflation compares prices with the previous month. Annual or year-on-year inflation compares prices with the same month in the previous year. Cumulative inflation measures the accumulated increase over a longer period.

What is purchasing power?

Purchasing power is the quantity of goods and services that a given amount of money can buy.

How does inflation affect wages?

Inflation reduces real wages when prices rise faster than salaries. A person can receive a nominal raise and still become poorer in real terms.

How does inflation affect savings?

Inflation erodes savings held in cash or in accounts that do not compensate for price increases. The saved amount may be the same, but it buys less.

What causes inflation?

Inflation can be caused or intensified by demand pressures, cost increases, supply shocks, currency depreciation, expectations, fiscal deficits, monetary expansion and institutional loss of credibility.

Does inflation always happen because money is printed?

No. Some price increases begin with real shocks, such as energy, war, logistics or food supply. But sustained and generalized inflation usually requires monetary, fiscal or institutional conditions that allow it to persist.

What do central banks have to do with inflation?

Central banks influence money, liquidity, interest rates, credit and expectations. That gives them a central role in controlling or worsening inflation, especially in fiat-money systems.

What does fiat money have to do with inflation?

Fiat money gives monetary authorities greater discretion because money is not directly convertible into a commodity such as gold or silver. That discretion can be abused if institutional limits are weak.

Why is inflation called a hidden tax?

Because it reduces the real value of the money people already hold without an explicit tax bill. It is not a legal tax, but it can transfer purchasing power in a similar economic way.

What does liberalism say about inflation?

Liberalism criticizes inflation because it weakens property rights, savings, contracts, economic calculation and individual autonomy. It also increases the state’s ability to finance itself indirectly.

Why do price controls not solve inflation?

Because they attack the visible price, not the underlying causes. If costs, money, deficits or scarcity remain, controls can create shortages, lower quality, queues and black markets.

Conclusion: inflation is loss of economic freedom in slow motion

Inflation is not just that things become more expensive. It is that money becomes weaker.

When a currency loses purchasing power, people lose real control over wages, savings, contracts and plans. They may keep the same nominal figures, but those figures represent less command over goods and services.

That is why inflation is not merely a technical issue for economists or central bankers. It is a problem of economic freedom.

A stable currency allows people to save, calculate, lend, invest, trade and plan. An unstable currency forces people to defend themselves against the money they are paid in.

From a liberal-libertarian perspective, the main warning is clear: when political power can finance itself by eroding the value of money, the cost does not disappear. It is transferred, silently and unevenly, to the people who hold that money.

Inflation does not need to expropriate formally to damage property. It only needs to make property worth less.