D. When supply and demand both increase, equilibrium price may increase, decrease, or remain unchanged.
With everything else remaining the same, an increase in demand will result in a rise in the equilibrium price and an increase in supply. Reduced demand will result in a drop in the equilibrium price and a reduction in supply.
With everything else remaining constant, an increase in supply will result in a decrease in the equilibrium price and an increase in the amount required. The equilibrium price will increase as the supply declines, while the quantity needed will go down.
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