Johann Heinrich von Thünen
![Johann Heinrich von Thünen, age 57](https://upload.wikimedia.org/wikipedia/commons/c/c1/Johann_Heinrich_von_Th%C3%BCnen_1840_portrait.png)
Even though he never held a professorial position, von Thunen had substantial influence on economics. He has been described as one of the founders of agricultural economics and economic geography. He made substantial contributions to economic debates on rent, land use, and wages. Provided by Wikipedia
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