Samuel Diaz, a delivery worker for Amazon Prime, loads his vehicle with groceries from Whole Foods in Miami. AP Photo/Lynne Sladky

Striking Amazon, Instacart employees reveal how a basic economic principle could derail our ability to combat the coronavirus

Delivery workers and others who ensure most people don’t have to go outside for essential goods are creating what economic theorists call an uncompensated ‘positive externality.’

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