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John C. Calhoun's idea that a state could determine if a federal law violated the rights of its citizens was called
Opportunity Cost
The loss of potential gain from other alternatives when one alternative is chosen, representing the value of the best missed opportunity.
Tractors
Agricultural machinery used for plowing, tilling, planting, and other farming operations.
Bicycles
Human-powered, pedal-driven vehicles with two wheels attached to a frame, one behind the other, used for transportation, recreation, or sport.
Production
The process of combining various material inputs and immaterial inputs (plans, know-how) to make something for consumption (the output).
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