Which of the following statements is incorrect? Assume upward-sloping supply curves.
a. If the supply curve shifts left and the demand remain constant, equilibrium price will rise.
b. If the demand curve shifts left and the supply increase, equilibrium price will rise.
c. If the supply curve shifts right and the demand curve shifts left, equilibrium price will fall.
d. If the demand curve shifts right and the supply curve shifts left, price will rise.