The document discusses economic theories of land use and agriculture from the 18th and 19th centuries. It summarizes Ricardo's law of rent from 1817, which states that rent is determined by the productivity of marginal land. It then discusses Von Thunen's model from 1826 of concentric crop zones around a central market based on transport costs, with more profitable crops closer to market. However, the model makes unrealistic assumptions and its predictions do not fully reflect today's dynamic agricultural system with changing technologies, markets, and farmer behaviors.

1. Economic Aspects (Cont.)

2. Ricardo Theory 1817

6. Von Thunen

13. CROPPING MODEL With increasing distance from a central market, farmers would grow different crops, producing a concentric pattern… The LOCATIONAL RENT of each crop: the difference between the market value per hectare and the costs per hectare of cultivation and transport to market. Because rents are higher near the market, farmers will intensify their production.

15. £ Distance from market Profit