Give an example of reverse hierarchical diffusion for culture

Walmart when it first began by spreading across small cities in Arkansas

Explanation:

The revere hierarchy of the diffusion is the spread of the ideas form the area to the areas and these are a small town and the those the temporary bypassing the urban areas. And spreads form the hierarchy of the places to the areas of the lower places.

Expansion diffusion - this is when an idea is created/develops in an area (the source) and remains strong there, while also spreading to different areas.