The most common type of settlement in the world is a nucleated settlement. Nucleated settlements are characterized by buildings clustered around a central point, such as a village green, market square, or religious center. This type of settlement is common in areas where people rely on agriculture or other primary industries, as it allows for shared resources and a sense of community. In contrast, grid settlements are characterized by a system of streets arranged in a grid pattern, and are more common in urban areas. Von Thunen's model, on the other hand, is a theoretical model that explains the location and distribution of agricultural activities based on transportation costs and market demand.