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In DaySim, the long-term models (work and school location choice) are run ten times while updating shadow prices for all parcels during every iteration to create a seed shadow price file to be used as input to the full model run. The intent is to make sure that there is a good match between the number of job available in a parcel and the number of workers choosing the parcel as their usual work location. The same applies for students and school locations.
When the user updates the employment and/or school enrollment data, the Shadow Price step should be rerun.