Less succinctly, but more seriously:

Game theory may not be explicitly used by firms to model and predict the behavior of their competitors or customers (although I believe it is), however, concepts familiar to any student of game theory are also well-known in business circles (even among non-Chicago MBAs). The example that comes to mind is defection in the last stage of an iterated PD. Any business person who doesn’t see that coming is in for a rude awakening.

I suppose in business circles one will find a less pure variant — these people don’t care about methodology, they care about money. So, you’re likely to see more about Kahneman and Tversky than about Luce and Raiffa. I say, nonetheless, that the glass is half full. Indeed, it is probably 90% full if you look at financial firms and decision theory.

But if you are going to do a proper scientific experiment, you have to have a proper control. The absence of game theory in the business literature doesn’t mean very much until we have something to compare this finding against. So let us ask how many …