From antiquity to the eighteenth century,which characteristics of cities remained very similar?

Question

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Throughout history, the physical layout of cities has remained fairly consistent. Urban areas have consistently been designed around centers of trade or government, with residential areas surrounding them. The grid pattern of streets has been used since ancient times and is still in use today, showing the strong continuity of this aspect of urban design. Technological innovation, economic conditions, and literacy rates, however, have varied greatly over time and are not consistent characteristics of cities from antiquity to the eighteenth century.

From Antiquity to the Eighteenth Century,which Characteristics of Cities Remained