Why Do Prices Differ Between Countries?
1. Quick Summary
Goods that can be shipped tend towards similar prices across borders, because if they did not, someone would buy cheap and sell dear until they matched. Services that must be delivered locally cannot be arbitraged, so their prices stay tied to local costs.
Since labour is the main cost in most services, and wages vary enormously between countries, the price of local services varies enormously too. That is the core of why living costs differ the way they do.
2. What It Means
The formal version is purchasing power parity, the idea that exchange rates should adjust so that a basket of goods costs the same everywhere. It works reasonably well for tradable goods over long periods and badly for services and housing.
The mechanism behind the failure is the Balassa-Samuelson effect. Countries with high productivity in traded goods pay high wages across the economy, including in sectors where productivity has not risen, so a haircut in a rich country is expensive because the hairdresser could earn a comparable wage elsewhere.
Housing is the largest single item and is entirely local. Land cannot be moved, and construction labour is local, so rents track local incomes and local supply constraints rather than anything international.
3. Why It Happens
Arbitrage only works where goods can move. A phone can be imported and sold anywhere, so its price converges once transport, taxes and warranties are accounted for. A restaurant meal cannot be imported, so nothing forces its price to converge.
Wages drive local costs directly. In a country where the average wage is a tenth of another’s, services performed by people will generally cost a fraction as much, which is why travel to lower-income countries feels inexpensive for visitors earning elsewhere.
Taxes, regulation and market structure add further variation. Different VAT rates, licensing rules, competition and rental costs all shift prices in ways unrelated to productivity, which is why even tradable goods often differ substantially at the till.
Exchange rates move for reasons unrelated to the price of goods. Capital flows, interest rate differences and speculation dominate short-term currency movements, so the rate you get when converting money often diverges sharply from what purchasing power would suggest.
4. Real Examples
The Big Mac index was devised as an accessible illustration of purchasing power parity, comparing the price of a standardised product across countries. It is a teaching device rather than a measurement, but it shows the pattern clearly.
Software and digital goods show the other extreme. Because distribution costs almost nothing, sellers can charge very different prices in different markets simply because they choose to, which is price discrimination rather than cost difference.
Rent is where visitors misjudge most. A city can feel cheap for meals and transport and still be expensive to live in, because housing is priced against local high earners and against supply constraints rather than against the visitor’s income.
5. How It Affects Us
The practical implication for anyone comparing countries is to separate tradables from non-tradables. Converting salaries at market exchange rates systematically understates living standards in lower-income countries, because local services cost less than conversion suggests.
That is why economists use purchasing power adjusted figures when comparing living standards across countries, while market rates remain the right tool for anything involving actual cross-border transactions.
For travellers and remote workers, the distinction is directly useful. Income earned in a strong currency and spent on local services goes much further than exchange rates alone would suggest, which is the whole basis of geographic arbitrage.
6. Key Takeaways
- Tradable goods converge in price; local services cannot, because they cannot be arbitraged.
- Local service prices track local wages, which is why rich countries are expensive for haircuts and meals.
- Housing is entirely local and usually the largest component of cost differences.
- Exchange rates reflect capital flows more than living costs, so comparisons need purchasing power adjustments.