  We investigate the dynamics of a trust game on a mixed population where
individuals with the role of buyers are forced to play against a predetermined
number of sellers, whom they choose dynamically. Agents with the role of
sellers are also allowed to adapt the level of value for money of their
products, based on payoff. The dynamics undergoes a transition at a specific
value of the strategy update rate, above which an emergent cartel organization
is observed, where sellers have similar values of below optimal value for
money. This cartel organization is not due to an explicit collusion among
agents; instead it arises spontaneously from the maximization of the individual
payoffs. This dynamics is marked by large fluctuations and a high degree of
unpredictability for most of the parameter space, and serves as a plausible
qualitative explanation for observed elevated levels and fluctuations of
certain commodity prices.
