  Who should be charged with responsibility for an artificial intelligence
performing market manipulation have been discussed. In this study, I
constructed an artificial intelligence using a genetic algorithm that learns in
an artificial market simulation, and investigated whether the artificial
intelligence discovers market manipulation through learning with an artificial
market simulation despite a builder of artificial intelligence has no intention
of market manipulation. As a result, the artificial intelligence discovered
market manipulation as an optimal investment strategy. This result suggests
necessity of regulation, such as obligating builders of artificial intelligence
to prevent artificial intelligence from performing market manipulation.
