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Today cities have a city center or downtown, sometimes coincident with a central business district.
Physical environment generally constrains the form in which a city is built.Beyond these "geomorphic" features, cities can develop internal patterns, due to natural growth or to city planning.In a radial structure, main roads converge on a central point.A typical city has professional administrators, regulations, and some form of taxation (food and other necessities or means to trade for them) to feed the government workers.(This arrangement contrasts with the more typically horizontal relationships in a tribe or village accomplishing common goals through informal agreements between neighbors, or through leadership of a chief.) The governments may be based on heredity, religion, military power, work projects such as canal building, food distribution, land ownership, agriculture, commerce, manufacturing, finance, or a combination of these.
Cities generally have extensive systems for housing, tranportation, sanitation, utilities, land use, and communication.