Bjorn Ulvaeus, one-quarter of Swedish pop group ABBA, became a standard-bearer for a world without cash after his son got burgled. Ditching coins and banknotes would hurt criminals and tax-dodgers while helping businesses and government budgets, he reckoned. “Sweden would be the ideal country to make cashless,” he told Bloomberg in 2014. “I think that should be the future.” Nearly a decade later, he’s almost got his wish.