The inhibiting effect of distance on the intensity and volume of spatial interaction is a key concept in geographical studies. It suggests that movement and interaction between locations are directly related to the distance separating them and negatively influenced by the effort (time and cost) required to overcome that distance. For example, the farther apart two cities are, the less likely people are to travel between them frequently, especially if travel is expensive or time-consuming.
Understanding this phenomenon is essential for analyzing various spatial patterns and processes, including migration flows, trade patterns, and the diffusion of innovations. Historically, advancements in transportation and communication technologies have effectively reduced the impact of separation, leading to increased interaction and interconnectedness across regions. This reduction in perceived distance is a central driver of globalization.