U.S. Dollar Index (DXY)

The U.S. Dollar Index (DXY) measures the value of the U.S. dollar relative to a basket of six major foreign currencies: the Euro (57.6%), Japanese Yen (13.6%), British Pound (11.9%), Canadian Dollar (9.1%), Swedish Krona (4.2%), and Swiss Franc (3.6%).

Why It Matters

DXY is the most widely referenced indicator of overall dollar strength. Since the dollar is the world's reserve currency and the primary medium for international trade, its value affects:

- Import/export prices for U.S. businesses

- Commodity prices (most are priced in dollars)

- Emerging market economies with dollar-denominated debt

- Returns on international investments

Market Impact

A rising DXY generally means the dollar is strengthening, which tends to pressure commodity prices (especially gold and oil), hurt emerging market currencies, and make U.S. exports more expensive. A falling DXY does the opposite—boosting commodities and emerging markets.

Fed Policy Connection

The dollar typically strengthens when the Fed is raising rates (attracting capital seeking higher yields) and weakens during easing cycles.

A Narrow Basket

Keep in mind that DXY's weights were largely fixed in the 1970s and are dominated by the euro (~57.6%), with no place for the Chinese yuan, Mexican peso, or other major trading partners. It is therefore more a gauge of the dollar versus developed Europe and Japan than a true trade-weighted measure. For actual trade exposure, economists prefer the Fed's Broad Trade-Weighted Dollar Index.

Term Guide: DXY (Dollar Index)

The U.S. Dollar Index (DXY or USDX) measures the value of the U.S. dollar against a weighted basket of six major world currencies. Created in 1973 by the Intercontinental Exchange (ICE) after the collapse of the Bretton Woods system, with a base value of 100.

Basket Composition & Weights

- Euro (EUR): 57.6% — by far the largest component

- Japanese Yen (JPY): 13.6%

- British Pound (GBP): 11.9%

- Canadian Dollar (CAD): 9.1%

- Swedish Krona (SEK): 4.2%

- Swiss Franc (CHF): 3.6%

Notably absent: Chinese Yuan (CNY), Korean Won (KRW), Australian Dollar (AUD), and all emerging market currencies. The basket has never been rebalanced since 1999 (when the Euro replaced the Deutsche Mark, French Franc, Italian Lira, Dutch Guilder, and Belgian Franc).

How to Read DXY

- Above 100: Dollar is stronger than the 1973 baseline

- Below 100: Dollar is weaker than the 1973 baseline

- Rising DXY: Good for U.S. purchasing power abroad; negative for U.S. exporters and emerging markets with dollar-denominated debt

- Falling DXY: Positive for commodities (priced in dollars), emerging markets, and U.S. multinationals' foreign revenue translation

Historic DXY Levels

- 1985 Plaza Accord peak: DXY reached ~164 (February 1985). The G5 then agreed to depreciate the dollar

- 1992 post-Plaza low: DXY fell to ~78 after coordinated intervention

- 2001 post-9/11: DXY at ~121 amid flight-to-safety into the dollar

- 2008 pre-GFC low: DXY fell to ~71 (March 2008) — all-time low

- 2022 Rate hike surge: DXY hit 114.8 (September 2022) — 20-year high. Fed hiked rates aggressively while ECB and BOJ lagged

- 2024-2025: DXY fluctuated between 100-108 as markets priced in Fed rate cuts

DXY's Market Relationships

- Inverse with gold: Gold (priced in USD) typically falls when DXY rises and vice versa. Correlation approximately −0.5 to −0.7

- Inverse with commodities: Oil, metals, and agricultural products priced in dollars become more expensive for non-dollar buyers when DXY rises, suppressing demand

- Positive with U.S. rates: Higher U.S. interest rates attract foreign capital → stronger dollar → higher DXY

- Emerging market stress: A strong dollar increases the burden of dollar-denominated debt in emerging markets (approximately $4 trillion outstanding, BIS 2023)

Alternatives to DXY

- Bloomberg Dollar Spot Index (BBDXY): Broader basket including CNY, KRW, AUD, MXN — more reflective of actual U.S. trade

- Fed Trade-Weighted Dollar Index: Includes 26 currencies weighted by trade volumes

- Real Effective Exchange Rate (REER): Adjusts for inflation differentials (BIS publishes monthly)

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