Note: This is post #63 in a weekly video series on basic microeconomics.
Common resources are nonexcludable but rival, says Alex Tabarrok in this video by Marginal Revolution University. For instance, no one can be excluded from fishing for tuna, but they are rival — for every tuna caught, there is one less for everyone else. Nonexcludable but rival resources often lead to what we call a “tragedy of the commons.” In the case of tuna, this means the collapse of the fishing stock. Under a tragedy of the commons, a resource is often overused and under-maintained. Why does this happen?
(If you find the pace of the videos too slow, I’d recommend 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.)
Click here to see other videos in the Introduction to Economics series.
