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When Kaleli Muli needed to buy rings for his wedding, he popped into his local superstore in a suburb of Kenya's capital to avoid the hassle of a trip downtown to find a jeweller.
He left 20 minutes later clutching a plastic bag with two gold bands worth 45,000 shillings ($492), happy with his purchase but also the time saved. Before the advent of hypermarkets, the rings might also have cost hours of shopping.