Willy Shih, professor at Harvard Business School, says that the complex, global, and just-in-time manufacturing processes we've developed in recent decades are highly susceptible to breakdowns, especially during a global pandemic. He explains why the shortages we’ve seen in 2020 - in goods from toilet paper to appliances - are indicative of a bigger problem and talks through ways can businesses protect themselves and consumers in the future. Shih is the author of the HBR article "Global Supply Chains in a Post-Pandemic World."