Question

edward ullaman's model of spatial interaction
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Answer 1

Explanation:

The Gravity Model holds that the interaction between two places can be determined by the product of the population of both places, divided by the square of their distance from one another. The primary implication of this model is that distance is not the only determining factor in the interaction between two cities...

Complementarity, transferability, and intervening opportunity are the three principles of spatial interaction.

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Answer 2

Explanation: There are three principals of spatial interaction by Edward Ullman who is a transportation geographer. Which are Complementarity, Transferability and Intervening opportunity. Now let us describe them for further information; Complementarity can be seen as the property of one or more energy sources to complement each other's production over a certain space or over time intervals. Tranferability is cost of movement between two places and Intervening opportunity is an alternative supply point.