Terry Anderson sent me this item (thanks Terry). It identifies completion rates as a problem for MOOCs, suggest that a response to that is to increase student interaction, and then suggests a Knowledge Stock Exchange (KSX) as a type of hgamification to actieve this result. On this model the 'stocks' being traded are ideas related to the course; students can purchase a share of the idea in order to edit it and improve the value of the idea, and then a period of judging creates the payoff. I have mixed feelings about the model; I've never seen the appeal of stock markets, virtual or otherwise. They just seem like legalized gambling, which to me is a poor foundation on which to base an economy (or incentive system generally). Still, the authors reported much improved retention.