While it depends on how you define "impact," I think it is hard to argue that metro Detroit has a bigger economic impact than Chicago It may be the case that Detroit's contributions are more visible [[i.e., cars), but Chicago is a far larger city and metro area, with a much larger economy. For example, Chicago's services economy [[finance, insurance, real estate) is one of the largest in the country, whereas Detroit's is comparatively tiny.
In 2010, the Chicago metro area had a GDP of about 532 billion, whereas the Detroit metro area had a GDP of about 198 billion. Suffice it to say that both are very significant, though.
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