Meta Platforms Inc.'s new personal AI agent, Muse, has caused a significant shake-up in the stock market, leading to substantial declines in shares of banks, insurers, online travel agencies, and telecom companies. The S&P 500 Financials Index dropped as much as 2.4%, reaching its lowest levels since July, while the banking index fell approximately 3%. This downturn is attributed to investor concerns that AI agents like Muse, which can compare prices, switch plans, and book services, will disrupt businesses that rely on consumer inertia—the tendency for customers to stick with existing providers out of habit.

Several prominent financial institutions experienced notable drops. JPMorgan Chase & Co., Morgan Stanley, and Wells Fargo & Co. all declined by more than 2.5%. Insurer Allstate Corp. and brokerage Charles Schwab Corp. fell more than 5%, with Charles Schwab specifically dropping 6.1%. Other affected financial firms included LPL Financial (down over 6%), Raymond James (down over 3%), and Ameriprise Financial (down 4.4%). Analysts warn that AI services could undermine the revenue structures of financial firms, particularly by reducing idle cash balances in brokerage accounts, from which these institutions generate substantial income.

Beyond the financial sector, the impact of Muse was felt across other industries. Online travel agencies Expedia and Booking Holdings both suffered drops of over 3% (Booking Holdings specifically fell 2.6%), as investors fear AI tools could allow consumers to bypass traditional platforms to find and book the best travel deals. The U.S. gym chain Planet Fitness plunged by as much as 11% during intraday trading, eventually closing down 9.5%. European telecom companies like Orange and BT Group lost about 4% each. A Goldman Sachs basket of stocks highly dependent on customer retention also fell 2.6%, marking its worst performance since February, indicating widespread concerns about AI agents disrupting long-term customer relationships and recurring payments.

Conversely, Meta itself saw a significant rally, with its shares surging more than 11% in a single day and over 20% since Muse's launch, adding more than $200 billion to its market value. Chipmakers and hyperscalers are also seen as major beneficiaries in this new AI agent economy, with Intel spiking 12%. Industry analysts, such as those from Bloomberg Intelligence, suggest that AI platforms like Muse could become new "digital toll collectors," intermediating transactions directly between customers and businesses and capturing revenue that currently goes to traditional platforms like Booking or Expedia.