When a city bids to host a Super Bowl, an Olympics, or a major championship, promoters almost always attach a headline number: hundreds of millions in new spending, thousands of jobs, a surge in tax revenue. The academic record suggests those figures deserve skepticism. A Harvard Growth Lab review of mega-event research concludes that any increased economic activity from hosting "is routinely dwarfed by additional public budgetary commitments," and that claims about multiplier effects and new revenues "tend to be exaggerated." The problem is not random error but a repeatable set of methodological flaws—and once you know them, you can interrogate any impact study you encounter.
Understanding Economic Impact Claims for Sporting Events
Economic impact studies are typically produced before an event, projecting how much visitor spending, job creation, and tax revenue a host region will gain. They are also frequently commissioned by parties with a stake in the outcome. Economist Victor Matheson, writing on Super Bowl impact claims, notes that the "lure of the Super Bowl is used to extract public financing from cities," which "creates ample reason to be skeptical" since study sponsors have "a financial interest in results that show large economic benefits."
Independent reviews have tested those projections against what actually happened. An examination of sporting event impact studies published in The Sport Journal points to ex post comparisons—measuring predicted gains against a city's actual post-event economic performance—as the tool for judging whether impact statements hold up in practice. The consistent finding across this literature is that the optimistic pre-event forecasts rarely survive contact with the data.
Common Methodological Flaws in Economic Impact Studies
The Sport Journal's analysis identifies a cluster of recurring errors. The first is the substitution effect: when attendees spend money on the event instead of on other local activities, the event "simply results in reallocation of expenditures in the economy, rather than in real net increases in economic activity." Money that was already going to be spent locally—on restaurants, shows, or recreation—merely moves; it is not new income.
The second is the crowd out effect. Major events are often staged in cities that are already tourist destinations. If hotels and restaurants "normally tend to be at or near capacity" during the event period, The Sport Journal explains, the contest "may simply supplant, not supplement, the regular tourist economy." A study that counts event visitors without subtracting displaced regular visitors inflates the net benefit.
Third, non-economic costs—traffic congestion, vandalism, environmental degradation, and disruption to residents' daily lives—are "rarely reported" in impact studies, citing Lee's 2001 research. Finally, there is the source objectivity problem: because these studies are so often used "by sports boosters to justify public expenditures on sports infrastructure," the ultimate question is whether analysis by agents with a vested interest can ever be an objective examination of an event's true impact.
