Coplan is partly right: the only way to prevent insider trading in prediction markets is to ban them altogether. Prediction markets are no exception. Rob Hanson, the economist known as the “godfather of prediction markets,” takes this ridiculous argument even further. Prediction markets also introduce a much darker problem than unfair financial gains, one that Forbes, Coplan, and Hanson all manage to ignore. The United States needs to follow in the footsteps of countries like Portugal and Hungary, and ban prediction markets altogether.