Geographers develop and test theories. A theory is a set of propositions that together seek to explain real-world phenomena. A general theory is one that can explain real-world phenomena in different times and places. Urban geographers have used general theories about urban development for a long time.
In this column, I look at one general theory of urban geography — something known as rent-gap theory — and how it can be applied to processes of gentrification in the USA today.
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