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Excerpt:
Sports economist Donald A. Coffin put it this way:
Those of us who do sports economics and urban economics seriously are almost constantly having to push back against those kinds of studies. The single most disturbing aspect of the IMPLAN model for local economic analysis is the wildly unreasonable values th[ey] have for multiplier effects (compared, for example, with the BEA's Regional Input-Output Modeling System). IMPLAN is exactly what you describe it as, a "model" designed to generate large impact numbers to please a client who wants to lobby someone.
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