The Dollar Index (DXY) — The One Chart Every Trader Watches

Summary

The DXY drives everything from emerging-market equities to commodity prices to gold.

Composition

The US Dollar Index (DXY) measures the dollar against a basket of six currencies: euro (57.6%), Japanese yen (13.6%), British pound (11.9%), Canadian dollar (9.1%), Swedish krona (4.2%), and Swiss franc (3.6%). The euro dominates by design.

Why DXY matters for stock traders

US large-caps in the S&P 500 earn roughly 40% of revenue outside the US. A strong dollar mechanically compresses those foreign-earned dollars when translated back at higher rates. Every 5% DXY rally is roughly a 2% headwind to S&P 500 EPS.

Why DXY matters for commodities

Global commodities (oil, gold, copper) are priced in dollars. A stronger dollar makes them more expensive in local currency for the rest of the world, softening demand. This is why gold and DXY typically move inversely — though the correlation breaks in crisis periods when both rally as safe havens.

Why DXY matters for emerging markets

Emerging economies often borrow in dollars. A rising DXY inflates their debt-service costs, tightens local financial conditions, and pressures EM equities.

The single-chart heuristic

If you can only look at one macro chart before a trading session, look at DXY. Its short-term trend correlates with risk-on/risk-off across every major asset class.

(Educational simulation only — not financial advice. Practice everything below with $100,000 virtual cash on TradeHQ.)

Key takeaways

• DXY is a basket weighted 57.6% to the euro.
• Rising dollar is a headwind for US large-cap EPS.
• Gold and DXY typically move inversely.
• EM equities are exceptionally DXY-sensitive.

Check your understanding

• Largest DXY weight: Options: Yen; Pound; Euro (~57.6%); Yuan. Correct answer: Euro (~57.6%). Why: Euro dominates the basket.
• Rising DXY is a headwind for: Options: Small caps only; US large-cap EPS; US Treasuries; US inflation. Correct answer: US large-cap EPS. Why: Foreign revenue translation.
• Gold vs DXY correlation is generally: Options: Strongly positive; Zero; Inverse (breaks in crisis); Random. Correct answer: Inverse (breaks in crisis). Why: Inverse in normal regimes; both rally in acute risk-off.
• EM equities tend to underperform when: Options: DXY falls; DXY rises sharply; DXY stable; US rates fall. Correct answer: DXY rises sharply. Why: Dollar strength tightens EM conditions.

Sources

• ICE — DXY (https://www.ice.com/products/194/US-Dollar-Index-Futures)
• FRED — Trade Weighted USD (https://fred.stlouisfed.org/series/DTWEXBGS)

Practise this lesson

Open the practice desk and apply this lesson immediately with $100,000 in virtual cash. Concepts become usable when they are rehearsed under simulated conditions, not when they are read. Educational simulation only — not financial advice.