Lesson 11
Shared Resources and Rivalry
See why a shared resource runs out even when everyone takes only a little, how people who share one keep it going, and why trying to stay one step ahead of a rival can spiral.
Mine to use, everyone’s to pay for
The milk in the office fridge runs out by Wednesday, every week. Nobody takes much: a splash here, a second coffee there. Each splash benefits the person who takes it, and its cost, no milk for someone on Wednesday afternoon, is spread thinly over everyone.
That’s a commons: a shared resource where using it helps me and costs all of us a little. Think of it as a stock with a flow in (the Monday delivery, or how fast the resource renews) and many small flows out. A commons doesn’t fail because anyone is greedy. It fails when total use outruns how fast it renews, and nobody can see that happening until it’s gone.