The term geographers use to represent the interdependence between geographic areas. The amount of spatial interaction is a function of the size of the interdependent populations and the distance between them.
The decline of an activity, a function, or an amount of interaction with increasing distance from the point of origin. The distance decay principle implies that as the distance away from the home or workplace increases, the number of possible face-to-face contacts usually decreases.
The distance beyond which cost, effort, means, and perception play an overriding role in our willingness to travel.
The emotional attachment to, and the defense of, home ground.
Area within which we move freely on our rounds of regular activity, sharing that space with others who are also about their daily affairs.
The types of trips individuals make, and thus the extent of their activity space, are partly determined by three variables:
1) People's stage in life (age)
2) The means of mobility at their command
3) The opportunities implicit in their daily activities