The document discusses two types of hierarchies: 1) A settlement hierarchy which ranks settlements from largest to smallest based on population size and number of services. The top-ranked settlement would be a large city with many hospitals, shops, etc. while a small village might only have a post office. 2) A shopping hierarchy which ranks shopping areas from those that sell high-order specialist goods to wide catchment areas, to those selling convenience goods to local neighborhoods. Large shopping centers would be at the top while corner stores would be at the bottom.