that develops in a source
and remains strong there while also spreading outward (the innovation, idea, or disease is moving).
Thus, the innovation spreads in a snowball effect
so that the total number of adopter
s and the area of occurrence
There are three types of expansion diffusion
- a form of expansion diffusion in which nearly all adjacent individuals are affected.
An example of this is the spread of Islam
from its hearth
on the Arabian Peninsula to Egypt
and North Africa
, through Southwest Asia
, and into West Africa.
- the main channel of diffusion is some segment of those who are susceptible
to (or adopt
ing) what is being diffused.
An example of this is the spread of AIDS in the United States. Not everyone is affected, only particular vulnerable groups are affected. AIDS
doesn't affect in
certain areas but instead appear as cluster
s in distantly separated cities on the map.
Another example is the acceptance of a new style of clothing or new hairstyle. A good number of women adopted the beehive hair-do in the 60's, but not all..
- a small portion of the population
accepts the idea or innovation
. This is a local
occurance. Some ideas are simply too vague, too unattainable, or too practical for immediate adoption.
An example of this is industrialization
. During the time of the industrial revolution
, only the countries with the capital
and the resources
were able to industrialize while some lesser developed countries still have not.