Non-Isotropic Conditions and the Shape of Market Areas
Under isotropic conditions each market has the same polygonal evenly spaced area. This theoretical condition is obviously rarely found in reality. The two most important non-isotropic conditions impacting on the shape market areas are differences in density (depicted here as concentric circles) and accessibility (depicted here as the presence of a road). The modified market areas are the possible outcome of non-isotropic conditions.