> Prediction markets don't have any "natural" reason like that for excluding insider trading.
No, they have a different reason. Consider the consequences of a sufficiently large prediction market bet on whether or not <head of state> will be assassinated this year.
Consider also the consequences of insiders and decisionmakers having an immediate financial incentive to take the other side of a bet whose outcome they control.
No, they have a different reason. Consider the consequences of a sufficiently large prediction market bet on whether or not <head of state> will be assassinated this year.
Consider also the consequences of insiders and decisionmakers having an immediate financial incentive to take the other side of a bet whose outcome they control.