The Nasdaq Composite ended slightly lower on Friday but posted its sharpest weekly loss since early April, as investors questioned how long the artificial intelligence boom could sustain recent market highs. The index slipped 0.21% to 23,004.54, bringing its total weekly fall to around 3%, while chipmakers and technology shares led the declines.Despite this pullback, the Nasdaq has surged more than 50% since April, when US President Donald Trump announced wide-ranging tariffs, with AI optimism lifting markets to record levels. However, sentiment cooled this week after Nvidia CEO Jensen Huang was quoted by The Financial Times as saying that China may surpass the US in the AI race. “We’re seeing this AI selloff continue after the comments we had about China winning the AI race,” said Michael O’Rourke, chief market strategist at JonesTrading in Stamford, Connecticut, as per news agency Reuters. He added that the sector’s weakness reflected “a recalibration of multiples” and some investors taking profits after a strong run.The S&P 500 rose 0.13% to 6,728.81, and the Dow Jones Industrial Average gained 0.16% to 46,987.10, both rebounding late in the session after reports suggested progress in ending the longest federal government shutdown in US history. The global equities index MSCI (.MIWD00000PUS) slipped 0.07%, and the STOXX 600 in Europe lost 0.55%, as weak trade data from China renewed worries over slowing global growth.Chinese exports fell 1.1% in October, the steepest decline since February, underscoring the damage from Trump’s tariffs and denting investor confidence across Asia.In the bond market, US treasury yields edged down after surveys pointed to worsening consumer sentiment. The University of Michigan’s preliminary index for November dropped to 50.3, the lowest since June 2022, driven by record-low views of current economic conditions amid concerns over the shutdown. The 10-year Treasury yield eased slightly to 4.091%.The US dollar weakened against major currencies, with the dollar index slipping 0.11% to 99.57. The euro firmed to $1.1563, while the yen weakened to 153.45 per dollar. As per Reuters, the shutdown has delayed key economic reports, though current indicators suggest the economy remains resilient, potentially reducing pressure for the Federal Reserve to cut rates at its December meeting.Meanwhile, oil prices rebounded on optimism after Trump met Hungary’s Prime Minister Viktor Orbán at the White House, fuelling hopes that Hungary could use Russian crude. US crude settled 32 cents higher at $59.75 per barrel, while Brent rose 25 cents to $63.63. Gold prices also firmed as investors sought safety amid uncertainty.

The Government should cut energy bills by removing renewables subsidies, reducing system costs and implementing efficiency standards for landlords, a think tank has urged.

Green Alliance says the measures could reduce the typical household fuel bill by £178 a year by 2030 – and much higher savings of up to £587 for families renting draughty, inefficient homes.

Reports suggest the Treasury is eyeing up removing VAT from energy and cutting efficiency programmes paid for through bills, as it seeks to bring down costs for households to tackle the cost-of-living crisis and counter criticism about the price-tag attached to net zero policies.

Green Alliance said the Government must act immediately to lower bills, with the average household paying £478 more in October 2025 than four years earlier – and nine million UK households in fuel poverty.

But the environmental organisation said cutting VAT and energy efficiency programmes would be the wrong way to do it.

Green Alliance senior policy adviser Stuart Dossett said: “We are still very much living in a cost-of-living crisis, which has been a fossil fuel-driven energy crisis.

“There are households up and down the country that are being battered by this, and many people, as we move into winter, will be unable to heat their homes to a comfortable temperature because bills are too high.”

While the Government has “rightly” recognised the need to bring down costs, Mr Dossett argued that bringing VAT rates down to zero could immediately cut bills, but would be a “forever more move”, as it would be politically difficult to reverse.

Using the £2.3 billion the VAT cut would cost the Treasury to take some green levies – focusing on subsidies for renewables dating back more than a decade – off bills and into government spending would still reduce consumer costs.

These would include the feed-in tariffs for household solar power and some of the “renewables obligation” subsidies for early clean electricity projects such as wind farms.

It would have advantages over zero-rating VAT as the schemes’ costs will decline until their conclusion in 2037, making it a better value move for the Government, Green Alliance argues.

And as they are levied on electricity bills, removing them would give greater savings to those who rely on direct electric heating – who tend to be lower income and in deep fuel poverty because of high running costs – while also incentivising take-up of clean electric-powered heat pumps.

Mr Dossett also warned the Government should not cut spending on energy efficiency measures, which pay for insulation and other improvements for households in fuel poverty via a levy on bills.

“If the Government is serious about lowering people’s bills for good, the way to do that is investing in insulating our homes, not raiding schemes that have helped families lower their energy costs as a way of making their sums add up in the Budget,” he said.

A new paper from Green Alliance launched ahead of the Budget also says that system costs could be reduced by 2030 with a series of “no regret” options, including lowering voltage levels on the low voltage network as modern appliances are using more power than they need.

Green Alliance also advocates for putting gas power plants in a “strategic reserve”, removing them from the power market and enabling system operator Neso to determining when to generate electricity from gas, to prevent high gas prices pushing up the cost of power.

And measures to reduce the financing costs of new renewables could cut how much they cost to build and the price of the electricity they generate, while boosting their deployment and reducing the UK’s exposure to expensive fossil fuels.

The think tank also calls for the Government to implement a private rental sector minimum energy efficiency standard equivalent to Energy Performance Standard (EPC) C by 2030, to help people in rented accommodation who are often the most vulnerable to high bills.

Mr Dossett said the move would be “crucially important for lifting huge swathes of households that are currently experiencing fuel poverty out of it”.

Other measures including installing smart meters that could also help people reduce energy use and cut their bills.

Taken together, a typical household could save up to £178 a year by 2030, and a family in rented accommodation that is improved from an EPC E to a C rating and gets a smart meter, could save up to £587 in total, Green Alliance said.

A spokesperson for the Department for Energy Security and Net Zero (DESNZ) said the Government did not comment on speculation over tax changes.

But they said: “The Government’s clean energy mission is exactly how we will deliver cheaper power and bring down bills for good.

“Our mission is relentlessly focused on delivering lower bills for the British people, to tackle the affordability crisis that has been driven by our dependence on fossil fuel markets.”

The spokesperson said the Government would publish an update on plans to make private rental homes reach EPC C standard by 2030 in “due course”, and was exploring options for rebalancing gas and electricity prices.