Adam Sitkoff, the executive director of the American Chamber of Commerce in Vietnam, said many companies were looking for workarounds and other remedies to help ease the stress.

“American companies are seeing what they can do,” Mr. Sitkoff said. “If we charter buses and send them to whatever province and hometown, will that help us get the people back?”

American businesses have pushed the Vietnamese government to speed up its vaccine program, which they say is essential for workers to feel safe. Only 29 percent of the population has been fully inoculated, one of the lowest rates in Southeast Asia. Vietnam says it hopes to fully vaccinate 70 percent of its population by the end of the year.

Nguyen Huyen Trang, a 25-year-old worker for Changshin Vietnam, a major supplier for Nike, is fully vaccinated but said she still feared being back on the factory floor. Ms. Nguyen and her husband returned to their home in Ninh Thuan, a province in central Vietnam, from Dong Nai when cases there started soaring at the end of July. Her husband wants to go back to the city, but her family is pressuring her to stay.

She said her manager called her in October and offered to increase her wages if she returned. Her response, she said, was “a definite head-shaking no.”

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Keith Haring’s Refrigerator Door Is on the Auction Block

It began life began as a white refrigerator door in an apartment in SoHo, but by the 1990s, it was anything but plain. It was covered with the graffiti tags and wide-marker signatures of the famous friends of the tenant in the apartment. “Madonna Loves Keith,” read one inscription.

Yes, that Madonna. The tenant was the artist Keith Haring, a star of the SoHo art scene, who partied with Andy Warhol and graffiti artists like LA II (whose real name is Angel Ortiz) and Fab Five Freddy (Fred Brathwaite), both of whom signed the refrigerator. Also on the door are the letters JM, which the auctioneer Arlan Ettinger, in an interview, speculated had belonged to Jean-Michel Basquiat, the downtown artist who became a megawatt celebrity. (Ettinger said he had tried to verify the Basquiat signature but that “there’s no way of absolutely confirming” it’s his writing or not.)

Ettinger, who will sell the refrigerator door on Wednesday at Guernsey’s, said the door served as Haring’s guest register. “It seemed like everybody who was anybody showed up there,” he said, “and you signed in on that refrigerator door. It’s not beautiful, but it’s of that moment, of that time. It reflects a certain spirit, a creativeness, that is alive today if you think about the people who were there — Madonna, and a long, long list of artists.”

Ettinger said the owner, a yoga instructor in California, had insisted on privacy, so much so that he said he did not even know her name. He said his contract to sell the door was with a friend of the owner who forwarded an email describing how the owner had found the apartment on Broome Street — she saw an ad for a “spacious railroad apartment” in The Village Voice in 1990. It came with “this amazing refrigerator covered with the graffiti of the Haring era.” The walls had once been covered, too, but she said that the landlord had repainted them.

She returned home one sweltering day to learn that the refrigerator had conked out and was removed; the delivery men had left it on the street to be picked up with the garbage.

“I raced outside,” the email said. “There, in the back alley, was our old friend, the Haring fridge, lying on its side. The door slipped off the body of the fridge easily. I brought it upstairs while my roommate retrieved the smaller top freezer door.”

In 1993, when she moved to California, she carted the door to her parents’ home in Washington, and stored it in their attic, where it stayed until about 2010, when her mother shipped it to her.

Andy Warhol, whose signature is also on the refrigerator door, figures in another item in the auction: A moose head he owned. The auction will be conducted online through Liveauctioneers.com and Invaluable.com, and by telephone from Guernsey’s. Ettinger’s estimate for the refrigerator door is “in the hundreds of thousands of dollars.”

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Judge presses Epic on the impact of its antitrust suit against Apple.

Last May, Epic Games was making plans to circumvent Apple’s and Google’s app store rules and ultimately sue them in cases that could reshape the entire app economy and have profound ripple effects on antitrust investigations around the world.

Epic’s chief operating officer, Daniel Vogel, sent other executives an email raising a concern: Epic must persuade Apple and Google to give in to its demands for looser rules, he wrote, “without us looking like the baddies.”

Apple and Google, Mr. Vogel warned, “will treat this as an existential threat.” To prepare, Epic formed a public relations and marketing plan to get the public behind its campaign against the tech giants.

Apple seized on that plan in a federal courtroom in Oakland, Calif., on Tuesday, the second day of what is expected to be a three-week trial stemming from Epic’s claims that Apple relies on its control of its App Store to unfairly squeeze money out of other companies.

must use Apple’s App Store to reach consumers.

“Our contention in this case is that all apps are at issue,” said Katherine Forrest, a lawyer at Cravath, Swaine & Moore.

Epic is not asking for a payout if it wins the trial; it is seeking relief in the form of changes to App Store rules. Epic has asked Apple to allow app developers to use other methods to collect payments and open their own app stores within their apps.

Apple has countered that these demands would raise a world of new issues, including making iPhones less secure.

On Tuesday afternoon, Benjamin Simon, founder of Yoga Buddhi, which makes the Down Dog Yoga app, testified about his company’s problems with Apple’s policies. Mr. Simon said that he had to charge more for subscriptions on the App Store to make up for the 30 percent fee that Apple charged him, and that Apple’s rules prevented him from promoting inside his app a cheaper price that is available on the web.

Mr. Simon said Apple warned app developers against speaking out about its policies in guidelines for getting their apps approved. “‘If you run to the press and trash us, it never helps,’” he said. “That was in the guidelines.”

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