When it comes to shaping the landscape outside of the city – our main point of investigation – the key element of the pre-modern city that matters is the intense demand it creates for agricultural products that the non-farmers who live in the city cannot produce themselves, chiefly (but not exclusively!) food. The intensity of that demand scales with the size of the city. A small town might only really shape land-use and farming patterns out a few miles; a huge mega-city like first century Rome (c. 1m people) re-shapes land patterns for hundreds of miles, its economic influence intruding into the territory of other, smaller cities.
Every town or city, of course, will be different. For agricultural societies especially, local terrain sharply constrains possible land uses. Some land is simply too wet or dry or rough or rocky or infertile for this or that purpose. In a modern city, apartments or factories or offices can be built almost anywhere; the sort of land suitable for intensive farming is more limited. This is even more true for pre-modern societies working without modern fertilizer, without electric-powered irrigation and without the industrial technology to massively reshape terrain (draining swamps, filling ravines, flattening hills, irrigating the desert, etc – some of these can be done with hand tools, but not to the extent we can today).
Still, we want to begin thinking about how cities impact the land around them without all of these difficult and confusing variables. We want to image a city, isolated and alone in the middle of an endless, flat and featureless plain. This is exactly what J. H. von Thünen did in The Isolated State (Der isolierte Staat). This kind of exercise can give us a baseline of what the landscape around a decent sized city might look like, which we can then modify to respond to different terrain, technology and social organization.
(Note: I would be remiss if I didn’t note that my discussion of these ideas owes heavily to Neville Morley’s Metropolis and Hinterland (1996), where he applied this very method to the city of Rome and its hinterland (and also first introduced me to von Thünen’s ideas). That book and also his Trade in Classical Antiquity are both great books to give a read if you want to begin building a sense of how pre-modern economies work).
The key factor von Thünen looks at is transportation costs. For a society without trains or trucks, moving bulk materials of any kind over long distances is extraordinarily expensive. Moving grain overland, for instance, would cause its cost to double after 100 miles. Thus land close to our theoretical city is extremely valuable for production, while land far away is substantially less valuable (because the end goal is transporting the agricultural production of that land to the city). As a result, transit costs – and thus distance – dominates how cities influence land-use patterns (along with population, which determines the intensity of the city’s influence).
Bret Devereaux, “Collections: The Lonely City, Part I: The Ideal City”, A Collection of Unmitigated Pedantry, 2019-07-12.
July 29, 2023
QotD: How pre-modern cities shaped the surrounding landscape
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