US Dollar 2025: Why It Is the World Reserve Currency and How It Influences Markets
The US dollar in 2025 remains the undisputed world reserve currency, despite growing BRICS attempts to build alternatives: 59% of global central bank currency reserves are still held in US dollars, OPEC oil is priced in USD, and over 40% of international SWIFT payments are denominated in dollars. For a European investor, understanding the role of the US dollar in global markets is not an academic exercise — it is a practical necessity: a standard portfolio with 60-70% MSCI World ETFs has a real dollar exposure exceeding 40-50% through the US securities included in the index. Therefore, the DXY (US Dollar Index), the EUR/USD exchange rate and Federal Reserve monetary policy are variables that directly influence the euro-denominated returns of any unhedged international portfolio. This guide explains why the US dollar is the world reserve currency in 2025, how the DXY is interpreted as a risk indicator for global investments, the impact of a strong or weak dollar on different asset classes, the real risk of BRICS de-dollarisation and the five-step strategy for managing currency exposure in a European portfolio. According to the International Monetary Fund (IMF COFER 2025), the US dollar represents 58.9% of global currency reserves, confirming its position as dominant reserve currency despite a decline of approximately 13 percentage points since 1999. For full currency context, read the guide on euro vs dollar EUR/USD 2025, the global recession 2025 and emerging markets BRICS 2025.
💡 DXY above 108 → EM and commodity pressure · ETF hedging: only for 1-3 year horizons
Why the US dollar remains the world reserve currency in 2025: the 5 pillars
First of all, to understand how the US dollar influences markets in 2025, it is necessary to understand why it became — and why it remains — the world reserve currency. Indeed, the answer is not trivial: the dollar maintains this position not by decree or formal agreement, but through a combination of structural factors that self-reinforce and make any practical alternative impossible in the short term.
| Pillar | Mechanism | Share / Size 2025 | Vulnerability | Risk Timeline |
|---|---|---|---|---|
| Central bank reserves | Central banks hold USD as primary reserve for currency stability | 58.9% of global reserves (IMF) | Slow diversification towards EUR and gold | Low in 2025 |
| Petrodollar | OPEC oil priced and settled in USD — creates permanent structural demand | 95%+ oil transactions in USD | Saudi Arabia sold small oil share in yuan | Low-Medium (5-10 years) |
| US Treasury market | US T-Bonds are the world’s most liquid safe asset — $36 trillion | Largest global bond market | US public debt above 120% of GDP | Low in 2025 |
| SWIFT trade dominance | 40-50% of international SWIFT payments in USD | ~40% of global SWIFT payments | Chinese CIPS alternative growing but marginal | Medium (5-10 years) |
| International bond issuances | 60%+ of international bond issuances in USD | ~60% of total international issuances | Euro and yuan gaining share in EM issuances | Medium (10+ years) |
How the DXY influences different asset classes in 2025: practical guide for investors
How to manage the US dollar’s impact on your portfolio in 2025: 5 steps
- First of all, calculate your actual US dollar exposure through portfolio ETFs — the first step in managing the US dollar impact on the portfolio in 2025 is awareness of how much dollar you already hold indirectly through international ETFs. Indeed, most European investors significantly underestimate their USD currency exposure: a MSCI World ETF contains 73% of US company securities quoted in USD; an S&P500 ETF is 100% USD; a MSCI EM ETF has approximately 30-40% indirect dollar exposure through the correlation of emerging currencies with the DXY. Therefore, a typical portfolio composed of 60% MSCI World + 10% MSCI EM + 10% S&P500 + 20% defensive has a real dollar exposure of approximately 48-56% of total portfolio — a significant share that moves both positively and negatively based on the DXY. Consequently, before deciding any hedging or currency risk management strategy, calculate this real exposure and assess whether it is in line with your risk profile and time horizon. Read the guide on international markets ETFs 2025 to understand how MSCI index composition determines your implicit currency exposure.
- Subsequently, monitor the DXY monthly as a macro risk indicator for the portfolio — the second step is integrating the DXY (US Dollar Index) into your monthly portfolio monitoring system. Therefore, the DXY levels to know in 2025 for portfolio management are: DXY below 92-95 = weak dollar, favourable scenario for commodities, emerging markets and euro-denominated returns from unhedged USD ETFs; DXY between 95-108 = neutral area, normal conditions; DXY above 108-110 = strong dollar, pressure on commodities, emerging markets and reduced currency advantage for unhedged European ETFs. Indeed, in 2025 the DXY is in the 100-106 area (neutral zone), meaning currency risk is not in an extreme phase in either direction. However, during global recessions or risk-off crises, the DXY tends to appreciate by 10-15% in a few months, as the dollar remains the primary global safe-haven asset. Consequently, during global crises, a portfolio with high unhedged USD exposure receives automatic currency protection — one of the little-discussed benefits of investing in unhedged international ETFs. You can monitor the DXY for free on TradingView (ticker DXY) or FRED (ticker DTWEXBGS) without expensive subscriptions. Read the guide on global recession 2025 to understand how the US dollar behaves during economic contractions and how this impacts the European portfolio.
- Then, choose the correct currency hedging strategy based on your investment horizon — the third step is the most common and most misunderstood decision in managing the currency risk of a European portfolio: to use or not to use EUR-hedged ETFs. Therefore, the answer depends exclusively on the time horizon: for horizons of 10+ years (the typical case of long-term monthly DCA) — do not use hedged ETFs; academic literature (Perold & Schulman, Campbell et al.) consistently demonstrates that currency risk tends to cancel out over long horizons, making the EUR/USD hedging cost (1.5-2.5% annually in 2025) unjustified; on an expected MSCI World return of 7-8% annually, giving up 2% in hedging cost reduces returns by 25-30%; for 3-7 year horizons — consider a 20-30% EUR-hedged ETF allocation, especially if EUR/USD is at historical lows (very strong dollar) and you want to reduce volatility in the most critical period; for horizons of 1-3 years or in imminent decumulation phase — hedging is more rational, especially when the DXY is in the 108+ area and dollar weakening is expected. Consequently, for 90% of Italian investors with long-term monthly DCA in 2025, the rational choice remains unhedged ETFs — and this choice should be maintained with discipline even when EUR/USD falls (dollar strengthens), avoiding changing strategy based on short-term oscillations. Read the guide on EUR/USD 2025 to understand the factors determining the exchange rate and the 2025-2026 outlook.
- Therefore, use gold and geographic diversification as natural low-cost currency hedges — the fourth step is building natural currency protection in the portfolio without resorting to hedged ETFs and their explicit costs. Indeed, two instruments are very effective as natural EUR/USD risk hedges for a European investor in 2025: (1) Physical gold (SGLD, TER 0.12%) — gold is priced in dollars on international markets, but when the dollar weakens against the euro, gold in USD tends to rise (inversely correlated with DXY) and the double effect (rising gold in USD + depreciating USD vs EUR) creates a natural compensating effect on the portfolio’s euro returns; therefore, a 5-10% gold portfolio allocation is an implicit currency hedge highly efficient at very low cost; (2) European ETF (EXW1, STOXX 600, TER 0.20%) — adding 10-15% European equity exposure reduces USD concentration by introducing a native EUR component unaffected by EUR/USD oscillations. Consequently, the combination MSCI World (70-73% USD) + 5-10% gold (inverse USD hedge) + 10-15% STOXX 600 Europe (native EUR) creates a naturally more balanced currency composition than MSCI World alone, without derivative hedging costs. However, it is fundamental not to confuse partial currency coverage with complete protection: EUR/USD currency risk in the portfolio is not eliminated, only attenuated. Read the guide on gold 2025 to understand in depth the inverse correlation mechanism between gold and the US dollar and how to exploit it in the portfolio.
- Finally, monitor BRICS de-dollarisation as a structural long-term trend but not as an immediate 2025 risk — the fifth step is maintaining the correct perspective on de-dollarisation: a real and relevant theme for the long term, but one that in 2025 requires no structural portfolio modifications. Therefore, the facts to keep in mind: the US dollar has fallen from 72% (1999) to 59% (2025) in global currency reserves, but this decline has occurred primarily in favour of the euro (19.7%) and gold (increasing share), not the Chinese yuan (which remained at 2.8% despite years of Chinese promotion); the common BRICS currency discussed at 2023-2024 summits never materialised due to political divergences between India, China and Brazil; Saudi oil sales in yuan remained marginal (below 5% of transactions). Consequently, the practical strategy for 2025 is to monitor the IMF COFER report (Currency Composition of Official Foreign Exchange Reserves) annually as a long-term signal of the international monetary system’s evolution — and consider gradually increasing European ETF (STOXX 600) and gold allocations over the decade if de-dollarisation accelerates. However, do not make urgent structural changes based on BRICS headlines: the history of the international monetary system teaches that reserve currency shifts happen over decades, not years. Read the guide on the Chinese yuan’s challenge to the dollar 2025 for a detailed examination of the renminbi as a potential long-term alternative to the US dollar.
Frequently asked questions on the US dollar and markets in 2025
Why is the US dollar the world reserve currency in 2025?
The US dollar is the world reserve currency in 2025 thanks to five structural pillars: the post-Bretton Woods system, petrodollar (95%+ of oil transactions in USD), the $36 trillion US Treasury market (the world’s most liquid), SWIFT dominance (40%+ of global payments) and a 59% share in central bank currency reserves. Therefore, despite BRICS de-dollarisation, no comparable alternative exists in 2025.
How does the DXY influence commodities and emerging markets in 2025?
The DXY has an inverse correlation with commodities: every DXY +10% generates on average a -5/-8% in oil, gold and copper prices in USD. For emerging markets, a DXY above 108 generates capital outflows and pressure on EM currencies. Therefore, the DXY level is one of the main macro drivers to monitor for those holding MSCI EM ETFs or commodities in their portfolio.
What is the DXY and how do I monitor it in 2025?
The DXY is the US dollar index against a basket of six currencies (57.6% euro, 13.6% yen, 11.9% pound, 9.1% Canadian dollar, 4.2% Swedish krona, 3.6% Swiss franc). In 2025 it is in the 100-106 area (neutral zone). Therefore, monitor it monthly on TradingView (ticker DXY) or FRED (DTWEXBGS) — below 95 is a weak dollar, above 108 is a strong dollar.
Is BRICS de-dollarisation a real risk for my portfolio in 2025?
BRICS de-dollarisation is a real but gradual trend: the dollar fell from 72% (1999) to 59% (2025) in global reserves, but the yuan remained at 2.8% despite years of Chinese promotion. Therefore, no immediate portfolio changes are needed in 2025 — de-dollarisation is a theme to monitor annually with the IMF COFER report, relevant for portfolio decisions in 2030-2035.
How to manage EUR/USD exchange rate risk in a European portfolio in 2025?
For a European investor with long-term DCA (10+ years): accept EUR/USD currency risk without hedged ETFs — academic literature demonstrates risk cancels out long-term and hedging cost (1.5-2.5%/year) destroys returns. Therefore, use gold (SGLD 5-10%) and European ETFs (10-15%) as natural hedges, and reserve hedged ETFs only for allocations with less than 3-year horizons.
Deepen your currency strategy: euro vs dollar EUR/USD 2025, Chinese yuan 2025, global recession 2025, emerging markets BRICS 2025, gold 2025 and international markets ETFs 2025.