Final answer:
In the Burgess model, the intensity/density of residential land use decreases with the distance away from the CBD due to land value. Land closer to the CBD is more valuable for commercial purposes, making it less affordable for residential use.
Step-by-step explanation:
In the Burgess model, the intensity/density of residential land use decreases with the distance away from the CBD because of the concept of land value. Land closer to the CBD tends to be more valuable because it is in high demand for commercial and business purposes. As a result, it becomes less affordable for residential use. Therefore, as you move away from the CBD, the cost of land decreases, making it more feasible for residential development.
For example, in the inner city zone of the Burgess model, high population densities are found because people live in high-rise apartments or tenements to make the most efficient use of limited land. As you move towards the outskirts of the city, you encounter working-class housing with single-family houses and duplexes, which have larger yards and lower population densities. Finally, in the suburbs and exurbs, houses are even larger with bigger yards, catering to the middle and upper-middle-class residents.