What happens when others benefit from your choices, like your decision whether or not to wear a mask? Or when your choices hurt others, like smoking?  Economists Betsey Stevenson and Justin Wolfers delve into the world of externalities and explore how policy makers can help ensure effects on others are taken into account. Co-host: Nastaran Tavakoli-Far. Editor: Alastair Elphick. A Modulated Media production.See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.