The economic concepts of supply and demand represent which of Ullman's three essential conditions for spatial interaction?

A. complementarity
B. intervening opportunities
C. transferability
D. none of these


Answer: A

Environmental & Atmospheric Sciences

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What will be an ideal response?

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Compare and contrast the topography and structure that would be present at all three spreading centers. What will be an ideal response?

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Which of the following terms is a measure of the weight of the air above a location?

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