Black Friday, the day after Thanksgiving that has become an unofficial shopping holiday in recent decades, seems to get bigger and bigger every year. And stores have been gradually opening earlier and earlier every year. Originally, Black Friday started on Friday morning at the normal store opening times. Then stores started opening earlier than usual that day. Then they started opening at midnight. Then they began to open even before midnight, on Thanksgiving Day itself. Everyone seems to hate the way that Black Friday is eating up Thanksgiving, but no one seems to be able to stop it. Why? Lets use Game Theory to make sense of this. Imagine you are the manager of a big retail store, and you have a choice between opening at the same time as last year on Black Friday, or an hour earlier. You know that a nearby rival store is facing the same choice. If the two stores open at the same time, they will make the same amount of money. But if one store opens earlier than the other, that store that opens early will take away 25% of the other stores customers. Explain what is going to be the Nash Equilibrium in this situation, and the decisions that lead us to that Nash Equilibrium.

200 words minimum.