Migration: Migration involves the movement of people from one place to another with the intention of settling there for an extended period. It can lead to cultural exchanges and the spread of ideas.
Contagious Diffusion: Contagious diffusion occurs when a characteristic spreads rapidly throughout a population without regard for distance. It's like how contagious diseases quickly spread between individuals who come into contact with each other.
Hierarchical Diffusion: Hierarchical diffusion is when an idea or innovation spreads from larger cities or influential individuals down to smaller towns or less influential people, like how fashion trends often start in big cities and gradually reach smaller towns.