I am working on a project attempting to estimate the economic impact of a $14M investment in water infrastructure (e.g new water, sewer & stormwater mains and lines). I have a specific cost breakdown, so I know that of that $14M, $7M was spent on construction services (58 Construction of other new nonresidential structures), $2.5M was spent on paving (56 Construction of new highways and streets) $3M was spend on design & management (449 Architectural, engineering, and related services) etc. I would like to be able to include all of these industries in the model, but will I need to worry about double counting because of the inter-industry spending? Or will that spending just be an additive? Is there a better way to do this? Furthermore, I do have the labor income for some of the industries but not for others (although I can estimate it). Should I need to do analysis-by-parts, is it possible to do it without labor income?
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