Fantastic ... there is also the "minority game" in which in each round each participant decides (at the same time) "up" or "down" and those who guessed the mino

Fantastic ... there is also the "minority game" in which in each round each participant decides (at the same time) "up" or "down" and those who guessed the minority opinion get a point, the majority lose one. People have tried to model the stock market with this repeated game.