A range of equity market bubble indicators show that while the S & P 500 ‘s rally has further to run this year, its medium-term prospects look poor given how frothy the market has become, according to Capital Economics. “Most indicators suggest the AI equity boom is nearing an end,” Capital Economics’ senior market economist James Reilly said Thursday in a note. Capital has been more bullish than most on the stock market since mid-2023, reflecting a view that AI will be a transformative technology. Its year end-2026 S & P 500 forecast has consistently been above consensus. But the firm has also maintained that the AI-driven rally is a bubble that will eventually burst. To assess and spot a late-stage market bubble, Reilly looks at eight indicators including valuations, earnings, index concentration, equity issuance and foreign interest in U.S. equities. Some of those measures are already at or near levels that preceded previous stock market peaks. The analysis shows that while market variables such as earnings expectations look consistent with a market top, others such as volatility and leverage look slightly less alarming. Earnings stand out as the biggest warning sign. Expectations for S & P 500 earnings growth are around levels seen only at the peak of the dot-com bubble, while long-term EPS growth forecasts have surged to a record high. According to Reilly, the heavy concentration of this expected growth in the tech sector means that any signs of weakness in the tech firms’ earnings will weigh heavily on the index. Other indicators are also flashing warning signs. Index concentration is around dot-com-era extremes, net equity issuance has turned positive and foreign ownership of U.S. stocks is at a record high. Reilly said another wave of IPOs and share sales could be particularly significant, since similar issuance booms have historically coincided with market peaks. “On past form, this suggests that the end of the bubble is just months away, rather than years,” he said. Measures of leverage are not yet alarming compared to other factors, though the analyst warns that they are heading in a “concerning direction.” While volatility metrics look consistent with a mid -stage bubble, Reilly notes that constituent -level volatility isn’t as extreme as it was near the end of the dotcom boom. “While we continue to think that the S & P 500 will rally from around 7,650 now to 8,250 by end-2026 , we ultimately forecast it to fall back to 6,500 by end -2027,” he wrote. Those assumptions would equate to 8% upside this year and a 21% slide in 2027.

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The British pound has largely shrugged off another change of government and geopolitical shocks to outperform many of its peers this year, but the currency’s recent weakness could be set to deepen.

Sterling has gained around 1.6% against the euro

It is near-flat against the U.S. dollar

The resignation of Prime Minister Keir Starmer on July 20 left Britain facing its seventh leader in 10 years, with markets watching closely whether a new administration would hold to the “fiscal rules” repeatedly emphasized by former Finance Minister Rachel Reeves.

U.K. borrowing costs have risen under Starmer’s quickly appointed successor Andy Burnham, also of the center-left Labour Party, but that has occurred in lockstep with a global government bond sell-off.

Matthew Ryan, head of market strategy at financial services firm Ebury, said that a “clean and orderly transition of power” had “removed a potential banana skin and eased the perceived political risk premium attached to the pound.”

Britain’s long-term borrowing costs are the highest since 1998

In a Friday note, Ryan said sterling had been “the surprise outperformer” among the G10 group of wealthy nations over the past three months, tying this to an unexpectedly resilient U.K. economy.

Gross domestic product grew by 0.4% in the second quarter, following 0.6% expansion in the first quarter — one of the strongest performances among advanced economies. Sunny weather and excitement around the FIFA World Cup boosted consumer spending, while business activity remained surprisingly resilient despite the volatile geopolitical backdrop.

The pound also drew support at the start of the Iran conflict in April on outsized market expectations for a monetary policy response to inflation fears from the Bank of England, Jane Foley, senior FX strategist at Rabobank, told CNBC.

The U.K. is highly vulnerable to higher oil and gas costs, both of which have spiked this year, helping push headline inflation near 3%.

Sterling weakness ahead?

Despite the resurgence of price pressures, the Bank of England has held its key interest rate at 3.75% throughout this year.

Current market pricing suggests low odds of a rate hike at its September meeting. In contrast, there are high expectations for a hike by the European Central Bank on Wednesday and, increasingly, the Federal Reserve later this month.

Central bank rate hikes typically boost their home currency.

Dovish messaging by the BOE on Sept. 17 would “further expose the pound” just before markets get anxious for the first annual budget announcement of Burnham’s administration on Oct. 28, Foley of Rabobank noted.

New U.K. Finance Minister John Healey said in a Monday speech that he would remain committed to fiscal discipline, while targeting a more even distribution of economic growth around the country — in contrast to the concentration of growth in powerhouse London.

JP Morgan U.K. economist Allan Monks said his remarks suggested a cautious approach to tax and spending changes given the backdrop of higher borrowing costs. The budget is likely to retain a focus on devolution, greater public control of public services and more private sector partnerships, but contain little to change the macro outlook, Monks said in a note Monday.

Ebury’s Matthew Ryan said the budget contained a high level of political risk, and was likely to contain “a combination of higher ancillary tax rates and an increase in debt issuance in order to fund Burnham’s spending ambitions.”

These could include changes to taxes on property purchases and local council duties, an introduction of a “mansion tax” and tighter pension and personal investment account relief, he said, adding that markets would be jumpy over anything that looked likely to dampen growth and squeeze the private sector, while simultaneously requiring more borrowing.

Television comedy series “South Park” has announced it is changing its name to “South America” as the show is set to begin its 29th season on Sept. 16.

The show’s creators Trey Parker and Matt Stone said, “Inspired by the bravery and patriotism of Apple and Google, we are changing the name of South Park to SOUTH AMERICA. We especially want to thank our parent company Paramount — a Skydance Capitulation.”

Parker and Stone’s statement comes after U.S. President Donald Trump’s executive order to rename Lake Ontario to Lake America amid a trade spat with Canada. Canadian officials said they will not recognize the new name.

Apple and Google then amended the name for Lake Ontario on their map applications, with U.S. users seeing “Lake America,” while Canadian users saw “Lake Ontario.”

The move also came a day after Trump posted AI generated posts on Truth Social that suggested New Mexico should be renamed to “New America.”

Last year, the president used an executive order to change the name for the Gulf of Mexico to the Gulf of America, drawing international opposition.

“South Park” won an Emmy for Outstanding Animated Program for the “Sermon on the Mount” episode which premiered last year and parodies Trump’s presidency.

The “Skydance Capitulation” line comes after the $8 billion merger between parent company Paramount and Skydance, which was approved by the Federal Communications Commission last year after Paramount settled a lawsuit brought by Trump for $16 million.

Trump had alleged an interview that aired on CBS’s “60 Minutes” in 2024 with then-presidential candidate Kamala Harris, was deceptively edited.

Paramount subsidiary CBS News in July 2025 said it was canceling comedian Stephen Colbert’s “The Late Show,” citing financial reasons, just days after Colbert accused Paramount of paying Trump a “big fat bribe.” The final episode of the show aired in May.

Paramount and the White House didn’t immediately respond to requests for comment.