Q251. Suppose the (time) cost of waiting behind someone with a big shopping cart in the super market checkout line is 10 minutes while the time behind someone with a very few items is 2 minutes. Consider three cities, A, B, and C. Suppose the probability of running into someone again soon in the grocery store is 0.1, 0.2, and 0.4 in cities A, B, and C, respectively. What do we predict? Which "path to cooperation" does this illustrate?