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The Nominal Effective Exchange Rate, abbreviated as NEER, measures how your country's currency performs against a weighted basket of currencies from your major trading partners. It is not a single exchange rate against one country. It is a composite index. If the United States trades heavily with Japan, the European Union, and Canada, the NEER for the U.S. dollar reflects a weighted average of how the dollar performs against the yen, euro, and Canadian dollar, with each currency weighted by its share of total trade.
The Bank for International Settlements publishes monthly NEER data for 64 economies, using manufacturing trade flows to determine the currency basket weights.
The starting point is a bilateral exchange rate between two currencies. The NEER takes those bilateral rates and combines them into a single index using trade-weighted averages.
The formula is a geometric weighted average. Each partner currency contributes to the index proportional to its share of the home country's total trade. The weights are not updated monthly. The Bank for International Settlements currently uses 2011 to 2013 averages as its base period, and the index is set to 100 as of that base period.
An index value above 100 means the currency has appreciated in nominal terms relative to the base period. A value below 100 means it has depreciated. An index that rises from 100 to 110 means you can buy 10% more of your trading partners' currencies, on average, than you could in the base period.
The Nominal Effective Exchange Rate does not account for differences in inflation between countries. If your currency appears stronger but your domestic inflation is much higher than your trading partners', your exports are still becoming less competitive in real terms even though the nominal rate has moved favorably.
The Real Effective Exchange Rate, abbreviated REER, corrects for this by adjusting the NEER using relative consumer price indexes. It is the more useful tool for assessing export competitiveness because it reflects actual purchasing power, not just the nominal movement in currency values.
Think of NEER as the sticker price and REER as the actual cost after accounting for inflation.
When the NEER rises, your domestic currency has strengthened on average against your trading partners. You can buy more foreign goods for the same amount of domestic money. That is good for consumers buying imported products. It is difficult for exporters because their goods cost more in foreign currency terms, reducing price competitiveness abroad.
When the NEER falls, your currency has weakened. Exports become cheaper for foreign buyers, which tends to boost export volumes. Imports become more expensive, which can feed domestic inflation.
Central banks monitor NEER to assess whether currency movements reflect genuine changes in competitiveness or just bilateral noise against a single currency. Policymakers at the International Monetary Fund use NEER data to evaluate external sector imbalances across approximately 90 member countries. Economists use it to compare exchange rate dynamics across different countries on a common basis.
A bilateral exchange rate like the euro-dollar tells you one piece of the picture. NEER tells you the full picture for a currency across all of its most important economic relationships.
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