Conditions for the Realization of a Spatial Interaction
interaction between location A and B can occur only if the three following
conditions are met:
- Complementarity. If location A produces / generates something
that location B requires, then an interaction is possible because
a supply / demand relationship has been established between those
two locations; they have become complementary. The
same applies in the other direction (B to C), which creates a situation
of reciprocity common in commuting or international trade.
- Intervening opportunity. If location C offers the same
characteristics (namely complementarity) than location B and is
also closer to location A, an interaction between A and B will not
occur and will be replaced by an interaction between B and C. An
intervening opportunity can also be partial as
only a part of the interaction is captured.
- Transferability. Transport infrastructures (modes and
terminals) must be present to support an interaction between A and
B. Also, these infrastructures must have a capacity and availability
which are compatible with the requirements of such an interaction.