In the sector model, Homer Hoyt added what main characteristic to a city's development? 
Definitions:
Syllogism
A form of reasoning in which a conclusion is drawn from two given or assumed propositions, each of which shares a common or middle term.
Premises
Statements or propositions from which a conclusion is logically derived in an argument.
Categorical Syllogism
A logical argument composed of three statements, where the first two are premises leading logically to a conclusion.
Independent
Not influenced by others; self-reliant or not depending on or connected to something else for its existence or function.
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