Which of the following will definitely cause an increase in the equilibrium price? A. An increase in both demand and supply. B. A decrease in both demand and supply. C. An increase in demand combined with a decrease in supply. D. A decrease in demand combined with an increase in supply. E. Any of the above, depending on the circumstances.

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Which of the following will definitely cause an increase in the equilibrium price?
A. An increase in both demand and supply.
B. A decrease in both demand and supply.
C. An increase in demand combined with a decrease in supply.
D. A decrease in demand combined with an increase in supply.
E. Any of the above, depending on the circumstances.

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