Daily Business Briefing: Markets rise as investors reconsider the unknowns of the Omicron variant.

Plus: Black Friday sales were up, but reflected the challenges facing retailers.

Nov. 29, 2021, 1:52 p.m. Eastern time Good afternoon. Jack Dorsey stepped down as the chief executive of Twitter. Mr. Dorsey, 45, who is also the chief executive of the payments company Square, was fired from the top job at Twitter in 2008 but returned in 2015. Mr. Dorsey's exit marks a significant shift at the company, which has navigated years of pressure from investors who thought it did not make enough money and criticism from Washington, particularly Republican lawmakers who complained that Twitter has helped stifle conservative voices in social media. Twitter's chief technology officer, Parag Agrawal, took over as C.E.O. READ MORE → Here's what is happening today Richard Drew/Associated Press Markets rise as investors reconsider the unknowns of the Omicron variant. After tumbling on Friday, the S&P 500 gained more than 1.5 percent and oil prices rose. Read more Black Friday sales were up, but reflected the challenges facing retailers. Business leaders are again wondering how to respond to a new virus variant. Airlines were seeing a travel rebound before Omicron arrived. The U.K.'s appeal for foreign truck drivers doesn't seem to be working. The race to secure Congo's cobalt supplies is at the center of the clean energy revolution. See the full briefing What do you think of this email? We would love to hear from you. Was this email forwarded to you? Sign up here to get this in your inbox. Get Business alerts as they happen with The New York Times app. Need help? Review our newsletter help page or contact us for assistance. You received this email because you signed up for Daily Business Briefing from The New York Times. To stop receiving these emails, unsubscribe or manage your email preferences. Subscribe to The TimesGet The New York Times app Connect with us on: Change Your EmailPrivacy PolicyContact UsCalifornia Notices The New York Times Company. 620 Eighth Avenue New York, NY 10018