One way the virus hurts the economy is by disrupting the supply of labour, goods and services. People fall ill. Schools close, forcing parents to stay at home. Quarantines might force workplaces to shut entirely. This is accompanied by sizeable demand effects. Some are unavoidable: sick people go out less and buy fewer goods. Public-health measures, too, restrict economic activity. Putting more money into consumers’ hands will do little to offset this drag, unlike your garden-variety downturn. Activity will resume only once the outbreak runs its course.