All told, along a three-hundred-mile stretch, I found twenty-six Chinese lingerie dealers: four in Sohag, twelve in Asyut, two in Mallawi, six in Minya, and two in Beni Suef. It was like mapping the territory of large predator cats: in the Nile Valley, clusters of Chinese lingerie dealers tend to appear at intervals of thirty to fifty miles, and the size of each cluster varies according to the local population. Cairo is big enough to support dozens. Dong Weiping, a businessman who owns a lingerie factory in the capital, told me that he has more than forty relatives in Egypt, all of them selling his products. Other Chinese people supply the countless underwear shops that are run by Egyptians. For the Chinese dealers, this is their window into Egypt, and they live on lingerie time. Days start late, and nights run long; they ignore the Spring Festival and sell briskly after sundown during Ramadan. Winter is better than summer. Mother’s Day is made for lingerie. But nothing compares with Valentine’s Day, so this year I celebrated the holiday by saying goodbye to my wife, driving four hours to Asyut, and watching people buy underwear at the China Star shop until almost midnight. ... No Upper Egyptian woman would wear such garments in public, but it’s acceptable at home. This is one reason that the market for clothing is so profitable: Egyptian women need two separate wardrobes, for their public and their private lives. ... In general, Chinese dealers prefer Egyptian Muslims to Christians. This is partly because Muslims are more faithful consumers of lingerie, but it’s also because they’re easier to negotiate with. The Copts are a financially successful minority, and they have a reputation for bargaining aggressively. This is what matters most to Chinese dealers—for them, religion is essentially another business proposition. ... differences seem perfectly matched for the exchange of lingerie. The Chinese dealers are small, and they know little, and they care even less—all of these qualities help put Egyptian customers at ease. ... “Their strategy is to make economic linkages, so if you break these economic linkages it’s going to hurt you as much as it hurts them.” ... In “China’s Second Continent,” published in 2014, Howard French estimates that a million Chinese live on the continent, and China does more than twice as much trade with Africa as the United States does.