This principle, similar to the central place theory, makes catchment areas an important area of study for geographers, economists, and urban planners. In order to compensate for income inequalities, distances, variations in secondary educational level, and other similar factors, a nation may structure its higher education [6] catchment areas to ensure a good mixture of students from different backgrounds. Hong Kong divides its primary schools into School Nets under its Primary One Admission System, functioning as catchment areas for allocation of school places.[7]