This analysis represents the scale of potential impacts on the economy and not benefit/cost ratios. Specifically, economic impact studies do not account for some of the social and environmental impacts that are included in benefit/cost studies, though they do account for indirect and induced economic growth that is typically not included in benefit/cost studies. The social and environmental impacts that are not counted within the GDP impact measure include, most notably, personal time savings and emissions impacts. The inclusion of these additional benefits would generate a larger measure of total societal benefit per billion dollars of public.
