Why a converted salary can mislead
A market exchange rate answers a narrow question: how many units of one currency trade for another in financial markets. It does not show how much everyday life costs in either country. A salary converted at that rate may therefore make someone in a high-cost city look richer—or someone in a lower-cost city poorer—than their local buying power suggests.
Comparing a common basket
To make a cost-of-living comparison, economists can price a representative basket of goods and services in each place: for example, food, housing, transport, and household expenses. They then use the difference between those local prices to adjust the currency comparison. This approach is called purchasing power parity, or PPP: the idea that money should be compared by what it can buy, not just by its market value.
Imagine two workers whose incomes look very different after conversion into the same currency. If rent and meals cost much less where one worker lives, that worker may be able to afford more locally than the converted figures suggest. PPP-style comparisons help make that difference visible.
A useful measure, not a personal budget
The result depends on the basket. Housing costs vary by neighborhood and household; people also buy different things and may face different prices. A national or citywide comparison can reveal broad differences in purchasing power, but it cannot tell a particular family exactly how far its income will go.
That distinction matters when comparing living standards across borders: a currency conversion describes financial value, while a local-price adjustment offers a closer—though still approximate—view of everyday buying power.
