That's what the owners tell you when they're trying to get their hands on your money, anyway. There's just one problem- it isn't true. https://www.brookings.edu/articles/sports-jobs-taxes-are-new-stadiums-worth-the-cost/ In every case, the conclusions are the same. A new sports facility has an extremely small (perhaps even negative) effect on overall economic activity and employment. No recent facility appears to have earned anything approaching a reasonable return on investment. No recent facility has been self-financing in terms of its impact on net tax revenues. Regardless of whether the unit of analysis is a local neighborhood, a city, or an entire metropolitan area, the economic benefits of sports facilities are de minimus.