1 Sept 2026 | 3 minutes to read
(All equity data is MSCI; all data in sterling unless stated)
The US has pivoted to economic sanctions to try to topple the Iranian regime – a development that may prolong global energy supply disruption and an unwanted source of inflation. At the beginning of March, the US said that its military campaign, Operation Epic Fury, would last 4-5 weeks. Six months on, US Treasury Secretary Bessent stated that Iran faces “economic isolation the likes of which the world has never seen”. The threat stretches to anyone trading with Iran. But only the biggest buyer of Iranian oil – China – could make a difference. Bessent’s words may arguably be performative.
Brent crude oil at around $88 per barrel suggests markets are not catastrophising. “Dark fleets” (tankers switching off transponders), smaller vessels shuttling through the Strait of Hormuz and pipelines have reportedly kept critical crude flowing. Analysts also believe that Iran transports thousands of tanker trucks daily into Iraq, Pakistan and perhaps Turkey.
Three factors are pressuring the US’s global leadership:
Underscoring this complexity, the CIA reportedly sent an envoy to Russia. Ukraine has had some success hitting Russia’s oil refineries. Together with diminished oil supply from the Gulf, refined diesel prices have risen starkly during harvest and holiday seasons. Wars are expensive and President Trump’s popularity is waning ahead of the mid-term elections in November.
All this led US Federal Reserve Chair Kevin Warsh to strike a hawkish tone at Jackson Hole, Wyoming. He dismissed taking any comfort from recent weaker inflation prints or that inflation is anchored longer-term. The odds of a September rate rise jumped from around 30% to 60% after his speech. The next set of jobs and inflation data (4 and 11 September, respectively), together with equity markets, will give investors another steer.
Trade tensions between the United States and Canada escalated last week after negotiations to resolve their tariff dispute broke down, with both sides blaming the other. As a result, the US implemented new 50% tariffs on approximately $20bn of Canadian goods from 22 August. Canadian Prime Minister Mark Carney subsequently unveiled retaliatory counter-tariffs on a "dollar-for-dollar" basis of between 15% and 50% on a range of US goods including steel, dairy products, agricultural equipment, pulp and paper, and electronics, from 8 September.
President Trump also announced plans to increase tariffs on Canadian vehicles, automotive parts and steel to 50% from January 2027, unless production is moved to the US. The move highlights Washington’s increasingly protectionist stance and raises concerns over the future of highly integrated North American supply chains. The dispute also became increasingly politicised, with Trump signing an executive order renaming Lake Ontario as Lake America.
While the direct economic impact appears limited, the escalation adds another source of uncertainty for investors at a time when markets are already grappling with elevated bond yields and interest-rate uncertainty. Businesses operating across North America's integrated supply chains, particularly in the automotive, industrial and manufacturing sectors, could face higher costs and disruption if tensions persist. A prolonged dispute could weigh on business confidence and economic growth expectations, creating another potential headwind for equity markets.
Nvidia’s latest results once again highlighted the strength of demand for artificial intelligence (AI) infrastructure. As the largest company in both the S&P 500 and Nasdaq with a market capitalisation of nearly $5.5trn, Nvidia is an important barometer for the technology sector and AI-related spending.
Second quarter results exceeded expectations, driven by strong demand for its AI products and continued growth in its data-centre business. Major customers, including AWS and OpenAI, remain committed to expanding AI infrastructure, while the rollout of Nvidia's next-generation Vera Rubin platform is progressing ahead of schedule. More importantly, management’s outlook exceeded expectations, with revenue forecast to grow by around 70% in 2028. Nvidia also indicated that demand continues to outstrip supply, reinforcing the apparent strength of the current AI investment cycle. Commentary on profit margins was also more reassuring than investors had feared.
AI-related companies have been a major driver of US equity market returns in recent years. Nvidia's results therefore provide an important gauge of both AI spending and the earnings outlook for the broader technology sector. Continued strong demand supports the case for further earnings growth across the sector, while any slowdown could have wider implications for US equity markets.
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