The Middle East energy crisis is sweeping through markets, revealing the multiple drivers behind the US Dollar Index's strength on March 4th. During the Asian and European trading session on Wednesday, March 4th, the US Dollar Index (DXY) extended its gains for a third consecutive day, rising as much as 0.2% to 99.284 intraday. This index measures the dollar's performance against a basket of six major currencies. The surge in oil prices is a significant contributor to the dollar's strength, bringing the narrative of a "dollar tax" to the forefront. Market attention is also focused on the upcoming US ISM Services PMI data.

The current phase of dollar strength is driven by a combination of factors: the "dollar tax" effect spurred by escalating Middle East tensions and soaring energy prices, cooling expectations for Federal Reserve interest rate cuts, and an influx of safe-haven capital. These elements create multiple layers of upward support. Geopolitical risks are being translated into a structural advantage for the US dollar through the energy channel, a dynamic that warrants close attention from investors.

Middle Eastern conflicts are disrupting energy supplies, leading to sharp spikes in oil and gas prices. The ongoing escalation of conflict is a core market variable. Following joint US-Israeli strikes on targets within Iran, regional energy export秩序 has been severely disrupted. Attacks on ships and energy facilities by Iran have led to blockades in Gulf shipping lanes, forcing a suspension of energy production along the route from Qatar to Iraq.

Impacted by supply shocks, US crude oil futures contracts rose 2.96% to $76.80 per barrel during Wednesday's early trading, reaching a new high since July 2024, with a cumulative gain of 14% since last Friday. European natural gas prices have surged 70% compared to the previous weekend, sharply intensifying global inflation fears.

In-depth analysis: This conflict directly severs approximately 20% of global oil transit routes. The contraction on the supply side, combined with seasonal demand recovery, is creating a spiraling price increase. Soaring energy prices not only push up corporate production costs but also amplify economic vulnerabilities in emerging markets and Europe through import dependency, laying the groundwork for subsequent inflation transmission.

The "dollar tax" effect is prominent, providing structural support for the dollar. The core support for the dollar from soaring energy prices is concentrated in the key logic of the dollar tax. George Saravelos, Global Head of FX Research at Deutsche Bank, explicitly stated that the core impact of the Iran conflict on the EUR/USD pair is concentrated in the energy sector.

The negative shock currently hitting the energy supply side is equivalent to a direct tax on European economies, and the associated costs must be paid in US dollars to overseas energy suppliers. As an economy highly dependent on energy imports, Europe is forced to passively increase its holdings of US dollars for energy settlement. This directly weakens the euro's purchasing power, providing sustained structural upward momentum for the US Dollar Index.

In-depth analysis: This mechanism is essentially "forced dollarization." European companies must sell euros and buy US dollars to pay higher oil and gas bills, creating consistent buying pressure. Unlike traditional safe-haven logic, the dollar tax is a rigid demand resulting from a supply shock and is difficult to substitute with other currencies in the short term.

Inflationary pressures are compounding with the continued cooling of expectations for Federal Reserve rate cuts. Even before the Middle East conflict erupted, Eurozone inflation data for February had already exceeded market expectations. High oil prices are further intensifying global inflationary pressures. These inflation concerns are fermenting, pushing the 10-year US Treasury yield higher for two consecutive days, currently holding steady around 4.06%.

The market has subsequently significantly scaled back bets on near-term Fed easing. Despite calls from US President Trump to lower borrowing costs, investors widely expect the Fed to keep rates unchanged until the summer. This cooling of rate-cut expectations is a direct driver of the dollar's strength.

In-depth analysis: High oil prices are rapidly transmitting through a cost-push inflation path to PCE and CPI. Under the Fed's "data-dependent" principle, it is forced to extend its tightening cycle. This reversal in expectations directly raises the dollar's real yield, attracting global capital back to the United States.

Non-US currencies are collectively under pressure, conversely boosting the dollar's strength. The escalation of Middle East tensions has sparked concerns in energy markets, and combined with diverging policy expectations, has led to widespread weakness in non-US currencies. The following table contrasts the performance of major non-US currencies:

| Currency | Change | Current Rate | Primary Pressure Source | | :--- | :--- | :--- | :--- | | Euro | Under significant pressure | — | Soaring energy import costs + Deteriorating ECB policy environment | | Japanese Yen | Performing weakly | — | Increased energy import costs | | British Pound | Down 0.3% | 1.3315 | Energy shock + Divergent UK economic data | | Australian Dollar | Down 0.6% | 0.6995 | Decline in global risk appetite (despite better-than-expected GDP) |

Analysts at ING noted that the European Central Bank's previously favorable policy environment is suddenly under pressure and difficult to repair in the short term. Expectations of resumed rate hikes could impact carry trades and push Eurozone government bond yield spreads wider, further suppressing the euro. Analysts at Capital Economics believe the Reserve Bank of Australia will remain wary of risks from economic growth exceeding its potential rate.

Summary and Technical Analysis: Multiple Logics Resonate, Sustaining Dollar Strength The surge in oil prices and the dollar tax effect triggered by Middle East geopolitical conflict, combined with rising inflation, cooling Fed rate-cut expectations, and an influx of global safe-haven capital, are creating a resonant pattern. This constitutes the most core upward momentum for the current US Dollar Index. As long as Middle East tensions show no significant easing, energy and policy logic will continue to dominate the dollar's trajectory.

Technical Perspective: The US Dollar Index has risen to the neckline of a previous double-top formation. The MACD currently indicates a bullish bias for the dollar, with support near the upper bound of the 98.60 box range and the 5-day moving average. Geopolitical developments will continue to influence the dollar's direction. If the conflict escalates, the dollar could challenge the 100 level.