There is growing skepticism among both academics and government officials about the benefits of large-scale sport and cultural events. Although Input-Output (IO) has long been the dominant approach to estimating the impacts of these events, the method faces criticism for both its lack of realism and the incompleteness of its results. Consequently, economists have begun to turn to two alternative approaches: computable general equilibrium (CGE) and cost-benefit analysis. These approaches can take into account effects not captured within an IO framework. They also often produce strikingly different results than those obtained using an IO model. This post reports some preliminary results from ongoing research evaluating nearly 60 studies that use cost-benefit methods to evaluate events. More complete results will be presented at the Society for Benefit-Cost Analysis Conference in March 2019.
An IO approach is fundamentally a multiplier approach, converting expenditures (on infrastructure, for example) into gross production in the host city. One limitation is that IO treats expenditures, such as those for infrastructure or by the local population, as fully additional; since this approach does not take account of substitution (i.e., that these resources have been diverted from other uses), it may overstate the favorable economic impact of an event. Another concern is IO’s focus only on gross domestic product and other related impacts, rather than on welfare, which also recognizes externalities and opportunity costs (Massiani 2018).