Buffers create trade areas by calculating a specified distance from a
store to the area that
surrounds it. They assume that all customers falling within the buffer's boundary
shop at the store.
Voronoi polygons create trade areas where every real world location is
attributed to the store that it is closest to.
The Huff Model calculates the likelihood of an individual using a
store based on the store's square footage and their distance from the store.
Don't forget you can resize stores by right clicking and dragging.