Currency depreciation is a fall in a currency’s value against another currency or a basket of currencies; inflation is a sustained rise in the general price level within an economy. Depreciation is about exchange rates, while inflation is about domestic prices. They can affect each other, but they are not the same measure.
What each term measures
Currency depreciation
Depreciation describes a currency losing exchange value relative to another currency or a basket of currencies. A depreciation claim should identify the currency pair or basket, the exchange-rate measure and the comparison period.
Inflation
Inflation is a sustained rise in the general price level, usually reported as a percentage change over a stated period. A common measure is the consumer price index (CPI), which tracks prices for a basket of household consumer goods and services. CPI does not cover every price in the economy: it excludes categories such as capital goods, business and government consumption, and asset prices. The IMF’s Consumer Price Index Manual: Concepts and Methods explains that CPI measures household consumption prices rather than all prices in the economy.
Why an exchange-rate number can be misleading
Exchange rates can be quoted in either direction. A rate may show how many units of domestic currency buy one U.S. dollar, or how many U.S. dollars buy one unit of domestic currency. With the first convention, a rise in the number can mean the domestic currency has depreciated; with the inverse convention, the same loss of value can appear as a fall. So “the exchange rate rose” is incomplete unless the quote convention is clear.
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For a useful comparison, specify the currencies, quotation direction and dates. A bilateral rate against one trading partner can move differently from a measure comparing a currency with a broader basket.
How depreciation can affect inflation
When a currency depreciates, imported goods and foreign-priced inputs can become more expensive in domestic currency. Businesses may pass some of those costs on to customers, contributing to consumer-price increases. The effect is not automatic or one-for-one: its size and timing depend on the country, period and circumstances.
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Keep the initial exchange-rate move distinct from later inflation data. A daily exchange-rate change and annual CPI inflation cover different periods and should not be compared as if they were the same statistic. Any claim about a connection should identify the country, price index and timeframe, and distinguish correlation from a demonstrated causal effect.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What the real effective exchange rate tells you
A real effective exchange rate (REER) compares a currency with a basket of trading partners’ currencies and adjusts for relative inflation. It therefore combines exchange-rate and relative-price information; it is not a country’s domestic inflation rate. In the IMF’s REER index convention, a rise indicates appreciation and a fall indicates depreciation.
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How to compare a depreciation figure with inflation
- Identify the measure: bilateral nominal exchange rate, effective exchange rate, REER, CPI or another price index.
- Check the exchange-rate quote: domestic currency per foreign currency, or the inverse.
- Align the periods: compare figures that refer to the same or clearly related timeframe.
- Check the scope: note the country and, for exchange rates, whether the comparison is with one currency or a weighted basket.
- Separate movement from cause: depreciation can contribute to inflation through import costs, but the strength and timing of pass-through vary.
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