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`-- Equal Competition Areas (Thiessen polygons) <br /> Another type of trade area is called an equal competition area (also known as Thiessen polygons <br /> in honor of Alfred Thiessen, a meteorologist who pioneered the method of creating areas out of <br /> spatially distributed data). This type of trade area assumes that consumers will travel to the <br /> closest business district in their region based on "as-the-crow-flies" distances. The trade area is <br /> formed by lines drawn exactly halfway between each of the competing business districts. Any <br /> point within the equal competition area is closer to the subject business district than any of the <br /> surrounding business districts. See the following map which illustrates this method. <br /> Example Map Showing Equal Competition Area <br /> Possible Convenience Trade Area <br /> using Retail Grocery Store Locations <br /> Gocery State <br /> Trade Area <br /> sf 1 Highway <br /> �. :- <br /> • County border <br /> A ,.. <br /> eltOMIee <br /> Ca a tOMITIS # <br /> 4 <br /> IMMO*WS <br /> nrrr�..ey Lod z, 1/4„,,012PS 7 ,,TO n E <br /> i'ewvr.rci I <br /> Since equal competition areas are based on as-the-crow-flies distances, these trade areas do not <br /> adjust for the way people actually travel on the ground. Further,they do not adjust for the <br /> drawing power of each competing business districts.Accordingly, it is helpful to use equal <br /> competition area maps along with drive time and other maps. <br /> 14 <br />