Which of the following statements is true ?

Which of the following statements is true?

A. An increase in supply causes a change in equilibrium price; the change in price does not cause a further change in demand or supply.

B. A decrease in supply causes equilibrium price to rise; the increase in price then results in a decrease in demand.

C. If both demand and supply increase there must be an increase in equilibrium price; equilibrium quantity may either increase or decrease.

D. If demand decreases and supply increases one cannot determine if equilibrium price will increase or decrease without knowing which change is greater.

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