You think the average city council in Mississippi (or hell, even the ten best city councils in Mississippi) are anywhere close to being able to determine whether subsidizing big box stores compared to local retail provides a positive or negative net return to the city?
Average ones? Prolly not, but ones in Starkville, Oxford, Cleveland, Hattiesburg, Meridian, Columbus, Coastal Cities, Metro Jackson One's, etc. should be able to.
National retailers have the best information on whether a particular town can support their store, but the town's officials should have the best information on where it should be located; keeping in mind the town's best interest from a big picture development stand point.