I am working on assessing the economic impact of constructing a facility in Williamson County, IL. The impact they want to see is a) Williamson County and Jackson County together and b)the remainder of the state. I am using sector 449 Architectural, engineering, and related services, and I have two models. My first model has Williamson County alone, and the SAM LPP is 38.05% My second model has both Williamson County and Jackson County. After importing the activity, however, SAM LPP drops to 34.56%. How is this possible?
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