As the UK hurtles towards an increasingly cashless society, a quiet countertrend is emerging from an unlikely place: Sweden.

Known for its enthusiastic embrace of digital payments, Sweden is now urging caution. The country’s central bank, Riksbank, recommends that every household keep enough cash at home to cover at least a week’s essential expenses. This recommendation, dubbed the “one-week cash stash”, is gaining traction as global uncertainty, cyber threats, and banking outages cast doubt on a...