Catherine Rampell reminds us: little to none. She notes:
[V]irtually every time a government or athletic organization describes the economic benefits of hosting a major sports event, economists pick apart the calculations as flawed, myopic or outright fraudulent. Economists interviewed for this column expressed skepticism about the widely cited estimate [of benefits to the city] of $550 million to $600 million. [Moreover, any] gains … are concentrated among a few beneficiaries — like hotels or, most obviously, the NFL itself. … [T]he sporting event represents a huge transfer of funds from taxpayers to a handful of special interests. … This is the standard assessment for almost any event for which governments bear the costs, including Super Bowls, Olympic Games and World Cups.
Yup, no surprise there to anyone who follows this kind of thing. That said, it’s a good time for one of my friends to have a party.