![Non-Isotropic Conditions and the Shape of Market Areas | The Geography of Transport Systems](https://i0.wp.com/transportgeography.org/wp-content/uploads/non_isotropic_shape_market_areas.png?resize=900%2C319&ssl=1)
Under isotropic conditions, each market has the same polygonal evenly spaced area. This theoretical condition is rarely found in reality. The two most important non-isotropic conditions impacting the shape of 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.