Trade

every trade is fair. watch what happens anyway.

equal starts, fair coin-flip trades — one person ends up with everything

Every trade here is fair by any reasonable definition — a coin flip between two equal parties, staking a fair share of what each one has. Run enough of these fair trades and wealth does not stay spread out; it keeps concentrating, tending toward one person holding it all, and a small constant tax that gives back what it takes is enough to stop the runaway.

Concepts: probability, inequality.

An interactive you play with one thumb, on Wundr.