The Economy of Cities
Jane Jacobs, 1969
Jacobs’s second book is stranger and more ambitious than her first. Where The Death and Life of Great American Cities defended the living city against planners, The Economy of Cities asks why cities generate new work at all — and concludes that the standard story of civilization has the arrow of causation reversed.
Import Replacement
The mechanism Jacobs centers is import replacement: a city buys something from elsewhere, then — through proximity, diversity, and the friction of serving local needs — figures out how to make it locally. The import is replaced by local production. That local production eventually becomes an export. New imports flow in to replace the old ones. The cycle continues.
Cities that can do this continuously grow and diversify. Cities that stop — that specialize in one or two exports without developing local productive capacity — stagnate and eventually collapse when demand for those exports contracts. Detroit made cars. Pittsburgh made steel. Manchester made textiles. Each was a great city during its export phase. The cities that remain great across centuries are the ones that never stopped replacing imports, which meant never stopping adding diverse new economic activity.
The implication is counterintuitive: diversity is the source of economic resilience, not specialization. The messy, mixed-use, apparently inefficient city was generating the conditions for its own continuous self-renewal. The rational thing — to zone by function, to streamline by specialization — destroys the engine.
The Agricultural Inversion
Jacobs’s most provocative argument: the conventional story of civilization has the causation backward. We’re taught that agriculture produced surplus, surplus enabled permanent settlements, permanent settlements became cities, cities produced culture. Jacobs argues that the early dense settlements of foragers and traders came first, and that the domestication of plants and animals happened inside or around those settlements — not out in the wilderness by nomadic bands.
The experimental conditions for domestication — repeated planting, observation across generations, selection for desirable traits — require people to stay put. Wild-food gatherers who happen to settle in a productive location, who begin tending stands of wild grain rather than just harvesting them, who observe what happens when seeds fall in disturbed soil near their middens — these people are doing something that requires settlement as a precondition.
The historical evidence is incomplete, and the argument remains contested. But the structural point holds regardless: cities generate new forms of economic activity; they don’t just consume what the countryside produces.
Connections
- Jane Jacobs — author; this extends the argument of The Death and Life of Great American Cities
- human-scale — the economy that fits the city that fits the person
- commons — shared economic infrastructure as generative, not merely distributive
- appropriate-technology — local production as alternative to external dependency
- replication-not-scaling — cities grow by replicating diverse productive activity, not by optimizing single exports
- seeds-not-solutions — the import replacement cycle as a model for how new capacity accretes
A city that can’t replace its imports is a city renting its own existence.