**EMBARGO: No electronic distribution, Web posting or street sales before 3:01 a.m. ET Thursday, Dec. 2, 2021. No exceptions for any reasons. EMBARGO set by source.** Marisha Wallace, who canceled her holiday trip to Switzerland after officials there imposed a 10-day quarantine, in New York, Nov. 30, 2021. The latest zigzag in the pandemic has already curtailed travel, but its broader impact on growth and inflation isn’t likely to be known for several weeks. (Joshua Bright/The New York Times)