The UK government’s recent “Be Ready” campaign advises households to keep a three-day supply of food and drink in case of emergency. Sales of bottled water and tinned foods have soared, as households ready themselves for a powerful storm, a long power cut or a cyber-attack. And preparing for three days of self-resilience seems like a sensible measure. But what happens on day four? The hope would be that order is restored, with no further need for people to rely on their own supplies.