What happens when others benefit from your choices, like your choice whether or not to wear a mask?Or when your choices hurt others, like smoking? Economists Betsey Stevenson and Justin Wolfersdelve into the world of externalities and explore how policy makers can help ensure effects on othersare taken into account.Co-host: Nastaran Tavakoli-Far. Editor: Alastair Elphick. A Modulated Mediaproduction. Summary How your actions affect those around you.