Let me start this article with some basic concepts on game theory: what is game theory? and, first, what is a game?

A game describes situations in which different agents interact “strategically” choosing rationally actions that maximize their individual targets up to a set of specified constraints.
The game theory proposes criteria to resolve and define the results of “strategic” interaction.
The term “strategic” is used to mean the fact that every agent’s choice of actions depends on his knowledge or expectations about the behavior of other interacting agents.

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