It is generally acknowledged that more people would like to attend the Super Bowl each year than in fact attend. (Presumably, many people stay away due to the high cost of the tickets, which are priced at many hundreds of dollars apiece.) Suppose a law were passed specifying that people who wished to attend need not even have a ticket, much less pay for one? How would attendance at the game change? What would determine who got into the stadium? Who would gain and who would lose due to the law?