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EXPANSION DIFFUSION

CONTAGIOUS EXPANSION

z The spreading of an innovation or idea through a fixed population in such a way that the number of those adopting grows continuously larger, resulting in an expanded area of dissemination

z The distance-controlled spreading of an idea, innovation, or some other item through a local population by contact from person to person

z Two types

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    Contagious Expansion

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    Hierarchical Expansion

z Analogous to the communication of a contagious disease

CONTAGIOUS EXPANSION

CONTAGIOUS EXPANSION

CONTAGIOUS EXPANSION

HIERARCHICAL EXPANSION

z A form of diffusion in which an idea or innovation spreads by “trickling downfrom larger to smaller adopting units

z An urban hierarchy is usually involved, encouraging the leapfrogging of innovations over wider areas, with geographic distance a less important factor.

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