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War and tariff threats are increasingly shaping the same market narrative, raising volatility across currencies, stocks, bonds and oil. The latest U.S. tariff threat aimed at the U.K. has revived uncertainty around trade, while Persian Gulf tensions have pushed oil prices higher and renewed inflation concerns. The result is a market that is balancing trade risk, geopolitical risk, bond yields and central-bank policy rather than reacting to a single driver.
President Donald Trump said the U.S. could impose a “big tariff” on the U.K. if it continues its Digital Services Tax. The tax levies a 2% charge on revenues from social media, search engine and online marketplace services related to U.K. users. The U.K. government said the tax generated £800 million in 2024-2025.
The dispute matters because it targets major U.S. tech companies including Apple Inc., Alphabet Inc. and Meta Platforms Inc. The U.S. argues the tax unfairly pressures U.S. companies, while the U.K. frames it as a revenue grab on digital services operating in the U.K., creating a direct clash of policy positions.
Market sensitivity is also heightened by timing. The U.S. and U.K. signed a trade agreement last year, but Trump has suggested trade deals are flexible. The tariff threat also comes ahead of the planned U.S. visit of King Charles III and Queen Camilla.
The U.S. is a major destination for U.K. exports. According to the USTR, U.S. imports from the U.K. totaled $64.8 billion in 2025, while U.S. goods trade with the U.K. was $161.8 billion.
A new tariff would raise the price of U.K. goods in the U.S., reducing demand—particularly in price-sensitive industries. It could also weigh on business sentiment if firms delay orders and investment.
The impact may vary by sector. Multinational corporations may be able to pass through some costs, while smaller firms could face greater pressure. Even before any tariff takes effect, the threat itself can undermine confidence by prompting companies to postpone orders, adjust contracts and add risk premiums.
Office of National Statistics data cited in the article also indicates that the value of U.K. goods exports to the U.S. stayed low in April 2025.
An escalation in the tariff battle could pressure GBP/USD by weakening the U.K. growth outlook and confidence. However, the U.S. dollar is near support at 98 on the Dollar Index. If the index falls below 98, the article says it could move toward long-term support near 96, which would act as a floor for GBP/USD even if U.K. risks worsen.
The setup is described as mixed: tariff risk is negative for sterling, while a weaker U.S. dollar would be supportive for GBP/USD. The article also points to higher U.S. Treasury yields as a counterweight. The 10-year yield is rebounding from a strong low at 4.25%, with the rally indicating a potential move toward 4.5%. Rising U.S. yields typically support the dollar, which would be negative for GBP/USD—especially if U.K. trade sentiment deteriorates.
Technically, GBP/USD is consolidating with a slight bullish bias above 1.32. The pair remains above the 50- and 200-day SMAs, and RSI is consolidating above the mid level. The article notes that a break above 1.3780 is needed to confirm bullish momentum, which it says may coincide with the U.S. Dollar Index breaking below 96.
EUR/GBP may rise if the dispute is interpreted as a U.K.-specific shock. The euro could strengthen relative to the pound if markets price in weaker U.K. exports, growth and policy uncertainty.
Despite the potential support, the article cautions that the euro is not risk-free. It notes EUR/GBP remains tight within a triangle formation between 0.86 and 0.8730, and that a break of either level is required to define the next move. It also states sterling is showing short-term strength as EUR/GBP moves toward triangle support at 0.86.
The U.S. Dollar Index is rebounding from support at 98, which the article says could signal another decline toward 96. Dollar weakness would normally support global risk assets and commodities, but the situation is described as more complex.
Crude oil prices are higher because peace negotiations in the Persian Gulf appear deadlocked. Brent crude has moved above $100 and is approaching $110, while WTI is moving toward $105. Higher oil prices can lift inflation expectations, which can support long-term yields and the dollar.
As a result, the dollar is described as being in a “squeeze.” Liquidity and risk appetite could push it down, while higher yields and inflation concerns could strengthen it. The article frames a fall through 98 as consistent with liquidity prevailing, while a rebound from 98 would suggest yields and inflation concerns are regaining control.
The FTSE 100 may react differently from the broader U.K. economy. A weaker pound can support many FTSE 100 companies because they earn substantial revenue overseas; when sterling falls, foreign earnings translate into higher pound-based revenue.
Tariff risk can still weigh on sentiment, particularly for companies with direct U.S. exposure if tariffs raise costs or reduce demand. Export-heavy sectors could also see more volatility.
Energy stocks may provide some support because oil prices are rising. Higher crude prices can lift oil majors and commodity-linked companies, helping the index hold up better than domestic U.K. stocks. Still, the article notes the FTSE 100 could struggle if trade tensions damage global risk appetite.
On technicals, the article says the FTSE 100 remains strongly bullish in the short term but faced strong resistance at 10,900 on 27 February 2026. After the U.S.-Iran war triggered a drop to a low at 9,670, the index rebounded from ascending broadening wedge support. It is currently consolidating between 9,900 and 10,900, seeking the next direction.
The Persian Gulf is highlighted as a major market driver. Oil prices are moving higher because talks for negotiated peace appear stalled. If the war continues to affect shipping or supply expectations, oil prices could remain elevated.
The article links oil shocks to inflation expectations through transport costs, manufacturing, food prices and retail prices—factors that can affect bonds and currencies. It also states that the first wave of inflation has already been observed in the latest consumer price index data.
That dynamic can pressure central banks: they may want to support growth but still need to contain inflation. The article notes that long-term Treasury yields are rising and that gold is weakening despite geopolitical uncertainty.
The S&P 500 is at a new weekly high above 7,000, which the article describes as a key bullish signal. However, it says the move still needs confirmation from the Dow Jones Industrial Average and the S&P 1500 Transportation Index to avoid the risk of a narrow breakout driven by a small group of large tech stocks.
The article describes a V-shaped recovery from support at 6,300, followed by a push above 7,000. It says the break above 7,000 has opened the door for a surge toward 8,000.
The Nasdaq 100 is supported by liquidity and big tech. The article says that since the December 2025 change, the Fed expanded its balance sheet, injecting $170 billion in liquidity through purchases of short-term T-bills rather than traditional QE. It argues this has helped markets after the repo crisis and supported growth stocks.
Technically, the article says constructive development suggests a surge to above 30,000. It also notes that tariffs remain a headwind for the broader market environment.
The Dow Jones Industrial Average is presented as a gauge of industrial and blue-chip sentiment. The article says a break above 50,000 in the Dow would strengthen the S&P 500’s bullish signal by indicating investors are not only buying tech.
It notes the Dow has reached 50,000 this week but has not broken higher in the same way as the S&P 500. It cites inverted head-and-shoulders patterns in 2022 and 2023 and an ascending broadening wedge pattern as evidence of bullish momentum, but adds that until 50,000 is breached, the S&P 500 rally is “questionable.” A break above 50,000 would open the door to a move toward 55,000.
The transportation index is described as even more vulnerable to trade and oil prices. Higher oil prices raise transport costs, while duties can depress trade. The article says the index has been stuck around 1,300, and that a break above 1,300 would provide stronger confirmation. If transports keep dropping, it would suggest the S&P 500 breakout is not backed by the real economy.
The article characterizes the current environment as highly sensitive. It says the $170 billion Fed liquidity infusion has eased pressure on risk markets, but has not removed pressure from tariffs, oil-driven inflation and rising long-term rates. With the S&P 500 already at new highs and the Nasdaq 100 rally led by tech, the FTSE 100 may be supported by oil and sterling weakness.
Still, tariff and war risks remain central. Trump’s comments add uncertainty for U.K. exports, and GBP/USD is at risk if sterling depreciation is offset by higher U.S. yields. EUR/GBP could gain if the dispute is treated as a U.K.-specific issue. The Dollar Index is approaching key support, but rising oil and U.S. bond yields could limit how far the dollar falls.
The article’s “best case” for the S&P 500 is confirmation from the Dow Jones 30 and the transportation index. It says that if the Dow breaks above 50,000 and transports break above 1,300, it would confirm bullish momentum in the S&P 500. If those levels fail, the breakout could be short-lived.
The main risk highlighted is that oil continues to advance, inflation expectations rise, and bond yields climb toward 4.5%. The article says that would be bad for gold, could pressure equity valuations, and could put renewed pressure on the dollar.
In conclusion, the article argues markets are handling two major shocks at once: tariffs threatening trade flows and war-related energy shocks lifting oil prices. Liquidity is supporting risk assets, but may not be enough to offset higher inflation, rising yields and trade risks.

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