Contagious Diffusion: Contagious diffusion is a type of cultural diffusion where an idea spreads rapidly throughout a population without regard for distance. It resembles how an infectious disease may spread among people in close proximity.
Expansion Diffusion: Expansion diffusion occurs when an idea originates in one place and then spreads outwards into new areas while remaining strong at its core. It is similar to how ripples expand outward when you drop a stone into a pond.
Hierarchical Diffusion: Hierarchical diffusion is the spread of cultural traits from one influential or dominant group to other less dominant groups. It can be compared to how fashion trends often start with celebrities and then trickle down to the general population.