Note: This is post #37 in a weekly video series on basic microeconomics.

What can the flu teach us about economics? In this video, Alex Tabarrok of Marginal Revolution University explains how vaccines produce positive externalities that help people stay healthy. When someone receives the vaccine, they pass along the positive benefits of the vaccine to others, generating positive externalities

(If you find the pace of the videos too slow, I’d mend watching them at 1.5 to 2 times the speed. You can adjust the speed at which the video plays by clicking on “Settings” (the gear symbol) and changing “Speed” from normal to 1.25, 1.5 or 2.)

Previous in series: An introduction to externalities