Do you think we don't know how Nash equilibrium works? The fact that the rules of a game can be adjusted to drive it away from optimum -- far away, sometimes ev

Do you think we don't know how Nash equilibrium works? The fact that the rules of a game can be adjusted to drive it away from optimum -- far away, sometimes even to the opposite extrema -- is a pretty basic economic concept and this is a pretty basic example of that concept. Market inefficiency 101 type stuff. That's why everyone else here is focusing on the metagame. And no, 2.5% is not typical. Maybe Walmart gets 2.5%. I've seen between 4% and 15% in those few instances when the man behind the curtain has been distracted and true rates have snuck past his veil of secrecy.