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WFN QUICK BRIEF · UNDER 1 MIN
The short version
MODE 2 OF 2
What the source establishes
Federal Reserve economists described a revised dollar-index methodology beginning in February 2019. The broad measure combines bilateral exchange-rate changes using geometric weights, with separate advanced-foreign-economy and emerging-market sub-indexes. The paper describes the design implemented then, rather than today’s constituent weights. Federal Reserve economists — Revisions to the Federal Reserve Dollar Indexes, January 2019 ↗
What the distinction changes
A bilateral rate answers what happened between two currencies. A broad index asks what happened across a specified basket. In an illustrative session, dollar weakness against the euro can coexist with strength against other partners; the combined result depends on the weights and magnitudes.
Questions for the next review
Record the series identifier, nominal or real treatment, frequency and current weight vintage. Compare like-for-like changes over the same dates. A historical methodology paper explains construction; the current statistical release is needed for current readings and any later revisions.
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WFN STORY COMPASS
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EDITORIAL ILLUSTRATIONWFN EDITION · 15 OCTOBER 2026
Editorial noteSource-based explanation with original WFN analysis. Historical records retain their original periods. Numerical examples are labelled as illustrative, not observed market data. AI-generated conceptual illustration; it does not document an actual event or product interface.
WFN REALITY LEDGER
What is on the record?
Primary-source explainer
Primary-source explainer; examples are explicitly illustrative
Primary record / reference periodJanuary 2019 methodology note; not a current index-level report
The cited material establishes the documented method or historical record. WFN analysis and illustrative calculations are labelled separately.
The Fed’s 2019 methodology includes goods and services trade. An index and EUR/USD can move differently without contradicting each other.
01 · VERIFIED RECORD
What the source establishes
Federal Reserve economists described a revised dollar-index methodology beginning in February 2019. The broad measure combines bilateral exchange-rate changes using geometric weights, with separate advanced-foreign-economy and emerging-market sub-indexes. The paper describes the design implemented then, rather than today’s constituent weights. Federal Reserve economists — Revisions to the Federal Reserve Dollar Indexes, January 2019 ↗
Its bilateral trade measure adds goods imports, services imports, goods exports and services exports. The authors explain that the indexes were designed to help assess the effects of dollar movements on US international trade. The note is research by Board economists, not a policy decision. Federal Reserve economists — Revisions to the Federal Reserve Dollar Indexes, January 2019 ↗
02 · WFN EDITORIAL ANALYSIS
What the distinction changes
A bilateral rate answers what happened between two currencies. A broad index asks what happened across a specified basket. In an illustrative session, dollar weakness against the euro can coexist with strength against other partners; the combined result depends on the weights and magnitudes.
For a currency desk, choosing the index is part of defining the question. A trade-oriented basket need not resemble the currency exposures of a particular company or investor. Treating it as a universal hedge benchmark would add an assumption that the methodology does not supply.
03 · WHAT TO CHECK NEXT
Questions for the next review
Record the series identifier, nominal or real treatment, frequency and current weight vintage. Compare like-for-like changes over the same dates. A historical methodology paper explains construction; the current statistical release is needed for current readings and any later revisions.
