  In this paper we study the properties of a Minority Game with evolution
realized by using genetic crossover to modify fixed-length decision-making
strategies of agents. Although the agents in this evolutionary game act
selfishly by trying to maximize their own performances only, it turns out that
the whole society will eventually be rewarded optimally. This "Invisible Hand"
effect is what Adam Smith over two centuries ago expected to take place in the
context of free market mechanism. However, this behaviour of the society of
agents is realized only under idealized conditions, where all agents are
utilizing the same efficient evolutionary mechanism. If on the other hand part
of the agents are adaptive, but not evolutionary, the system does not reach
optimum performance, which is also the case if part of the evolutionary agents
form a uniformly acting "cartel".
