Dollar Index (DXY) Explained

The Dollar Index (DXY) measures the US dollar's value against a weighted basket of six major foreign currencies. It's the benchmark for currency markets, the metric that affects virtually every global asset class, and one of the most important macro variables to understand because dollar strength or weakness ripples through commodity prices, emerging markets, foreign earnings of US multinationals, and global financial conditions.

What it measures

The DXY is calculated from the geometric average of the dollar's value against six currencies, with weights:

• Euro (EUR): 57.6% weight
• 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%

The euro's dominant weight makes the DXY effectively a "dollar vs euro plus other developed currencies" measure. It excludes important currencies like the Chinese yuan, Mexican peso, and most emerging market currencies.

The index was set to 100 at inception in 1973 (when the Bretton Woods system ended). Higher values indicate stronger dollar; lower values indicate weaker dollar.

Historical DXY ranges:

• Late 1970s: Below 80 during dollar weakness phase
• Mid-1980s: Above 160 during Volcker era strong dollar
• 2001-2008: Persistent decline from 120 to 70 during dollar weakness phase
• 2014-2016: Rapid appreciation from 80 to 100 as Fed prepared to hike
• 2022: Spike above 114 during aggressive Fed tightening
• 2024-2025: Trading in 100-108 range as cycle matured

Other dollar measures include the broader trade-weighted Federal Reserve Dollar Index, which includes more currencies and provides different signal than the headline DXY.

How to use it in practice

Dollar dynamics affect different asset classes:

Commodities: Generally inversely correlated with the dollar. Most commodities (oil, gold, copper) priced in dollars; dollar strength makes them more expensive in foreign currency terms, reducing demand. Dollar weakness has the opposite effect.

Gold ($GLD): Particularly sensitive to dollar movements. Gold often rallies during dollar weakness and faces headwinds during dollar strength.

Emerging markets ($EEM): Dollar strength typically pressures emerging markets through:

• Higher cost of dollar-denominated debt
• Capital outflows from EM assets to US
• Lower commodity prices (many EMs are commodity exporters)
• Weaker local currencies

S&P 500 multinationals: Companies with significant foreign revenue see weaker results when translated to dollars during periods of dollar strength. Approximately 40% of S&P 500 revenue comes from outside the US.

US exports: Stronger dollar makes US exports more expensive abroad, hurting export-dependent companies.

Foreign equities translated to dollars: When dollar strengthens, foreign returns decline in dollar terms even if local market returns are positive.

The 2022-2024 dollar cycle illustrates the dynamics:

• 2021: DXY around 90-95, weakness phase as Fed maintained easy policy.
• 2022: DXY surged to 114, the strongest dollar in 20 years. Driven by Fed tightening ahead of other central banks. Pressured emerging markets, commodities, and foreign earnings.
• 2023: DXY moderated to 100-105 range as Fed neared peak rates.
• 2024-2025: DXY oscillated around 100-108 as US economic exceptionalism balanced against Fed cuts.

The drivers of dollar movements include:

Interest rate differentials: Higher US rates relative to foreign rates typically support the dollar. The dramatic 2022 dollar surge largely reflected Fed hiking faster than ECB or BOJ.

Growth differentials: Stronger US growth relative to foreign economies typically supports the dollar.

Risk regime: The dollar often serves as safe haven during global stress, gaining on risk-off flows.

Trade flows: Persistent US trade deficits create structural dollar selling pressure, though this is offset by foreign investment in US assets.

Reserve currency status: The dollar's role as global reserve currency provides structural support, though debates about "de-dollarization" have intensified.

For sector positioning during different dollar regimes:

Strong dollar period:

• Domestic-focused stocks outperform multinationals
• Growth and tech (often less foreign-exposed) outperform value
• Energy ($XLE) often pressured (commodities lower)
• Emerging markets ($EEM) underperform
• Gold ($GLD) faces headwinds

Weak dollar period:

• Multinationals benefit from currency translation
• Energy and materials benefit from commodity strength
• Emerging markets typically rally
• Gold often performs well
• Inflation pressures may build through import prices

The relationship between the dollar and Treasury yields is complex. Generally:

• Rising US yields support the dollar (capital flows seeking yield).
• But sometimes both rise together (during inflation/Fed tightening combined regimes).
• Or both fall together (during global growth optimism reducing safe haven demand).

The dollar's interaction with Fed policy creates important market dynamics. When the Fed pivots dovish (lower rates), the dollar typically weakens. When the Fed pivots hawkish, the dollar typically strengthens. Markets price these reactions in real time, often producing significant currency moves around FOMC meetings.

Common mistakes

Treating DXY as the entire currency picture. DXY excludes many important currencies. Trade-weighted dollar indices give different (often less extreme) readings than DXY.

Ignoring carry dynamics. The dollar can fall against high-yielding currencies (like emerging market currencies) even when DXY rises against developed market currencies.

Assuming dollar movements are quickly absorbed. Currency effects on corporate earnings and commodity prices often lag by quarters. The full impact of 2022 dollar strength took quarters to fully manifest.

Forgetting the bilateral perspective. "The dollar is strong" might just mean "the euro is weak" due to ECB issues. Always check whether dollar moves reflect US strength or foreign weakness.

ACCE perspective

The dollar isn't directly in our scoring system, but it's a foundational macro input that affects multinational earnings, commodity prices, and emerging market exposure across our coverage. Our financial models for multinational and commodity-exposed coverage incorporate currency assumptions in revenue and cost projections.

For investors building portfolios, dollar dynamics matter for both direct currency exposure and indirect effects through commodities, emerging markets, and multinational earnings. Recognizing the prevailing dollar regime and likely direction shapes appropriate positioning across multiple asset classes and sectors.