Currency depreciation is a fall in a currency’s value against another currency or a basket of currencies; inflation is a sustained rise in prices within an economy. One describes exchange rates, the other domestic prices. They can affect each other, but they are not the same thing.
What each term measures
Currency depreciation: exchange value
Depreciation means a currency has lost value relative to another currency or a basket of currencies. A reported figure needs a currency pair or basket, a quotation convention, and a comparison period: “the exchange rate rose” does not establish by itself which currency weakened.
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Inflation: changes in prices
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 representative basket of goods and services purchased by households.
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CPI is not a complete measure of every price in an economy. The International Monetary Fund’s Consumer Price Index Manual: Concepts and Methods explains that CPI covers household consumer purchases, not capital goods, business or government consumption, or asset prices. As a result, CPI inflation and movements in other prices can differ.
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Why exchange-rate direction can be confusing
Exchange rates can be quoted in either direction. If a rate is stated as domestic currency per U.S. dollar, a rise means more domestic currency is needed to buy one dollar, so the domestic currency has weakened against the dollar. If the rate is quoted as U.S. dollars per unit of domestic currency, that same weakening appears as a fall. Always check what one unit of the quoted currency buys before interpreting a rate change.
Also check whether a figure is bilateral, comparing two currencies, or effective, comparing one currency with a weighted basket of trading partners’ currencies. The result can differ depending on the currencies and weights included.
Can depreciation cause inflation?
It can contribute to inflation, but it does not do so automatically or by a fixed amount. When a currency weakens, imported goods and inputs priced in foreign currency may cost more in domestic currency. Businesses may pass some of those higher costs on to customers, which can affect consumer prices. The size and timing of that pass-through depend on the country and period.
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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Keep the exchange-rate move separate from subsequent inflation figures: they measure different things, and a daily currency change cannot be compared directly with annual CPI inflation unless the periods and measures are aligned. A claim about the relationship should identify its country, price index, exchange-rate measure, and time frame.
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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 combines exchange-rate and relative-price information, so it is not a domestic inflation rate. In the IMF’s REER index convention, a rise indicates appreciation and a fall indicates depreciation.
For example, the IMF reported that during the first three months of 2026 the U.S. dollar REER depreciated by 0.6%, the euro REER appreciated by 0.6%, the yen REER depreciated by 3.1%, and the renminbi REER appreciated by 1.4%. These are basket-based REER movements adjusted for relative inflation—not domestic CPI inflation rates or necessarily bilateral nominal exchange-rate changes. See the IMF’s May 6, 2026 data brief.
How to compare a depreciation figure with inflation
- Identify the measure: Is it a bilateral nominal exchange rate, an effective exchange rate, a REER, CPI, or another price index?
- Check the quote direction: Does the rate show domestic currency per foreign currency, or the inverse?
- Align the periods: Compare like with like, such as changes over the same months or year.
- Check the geography and basket: A currency can move differently against one trading partner than against a weighted basket; CPI reflects a particular country’s household-consumption scope.
- Separate movement from cause: A depreciation may contribute to inflation through import costs, but the relationship’s strength and timing are country- and period-specific.
Why exchange-rate policy and inflation are discussed together
Exchange-rate arrangements can be part of a country’s approach to price stability. An IMF paper on exchange-rate pegs notes that price stability is a key objective of pegs and that a crawling peg can sometimes accommodate a persistent inflation differential with the anchor currency. That policy connection does not make depreciation and inflation synonyms: one is an exchange-rate movement, the other a change in domestic prices.
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