On these types of IDIQ contracts, contractors compete to be added to a list of pre-approved vendors so each individual contract need doesn't need to be competed. This is on the SEWP page, it might help explain a little... "SEWP offers low prices (generally below GSA schedule prices), the lowest surcharge (0.39%) and the easiest and fastest ordering procedure using pre-competed contracts." https://www.sewp.nasa.gov/about_us.shtml
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