History I / Cultural Geography and Diffusion
Practice question · Multiple choice

A trait spreading by hierarchical diffusion reaches large cities far apart before the countryside between them. Why does that pattern rule out simple contagious diffusion?

Hints
  1. Sketch where each model predicts the trait appears SECOND.
  2. Ask what "near" means in each network.
Show the answer

B. Because jumping between distant cities shows connectivity

Why

The map distinguishes the models. Contagion produces an expanding blot; hierarchy produces distant nodes lighting up out of geographic order, because the links that matter run city to city.

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