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In the U.S., recent retail earnings were almost a complete disaster with historic post-earnings plunges for some of America’s best known names. So it was quite a relief to see one of Africa’s top e-commerce companies, Jumia Technologies (NYSE:JMIA) pull off a 30.9% post-earnings surge. Going into earnings, e-commerce company JMIA had lost a soul-crushing 91.6% from last year’s all-time high. This stock market no…