All Rights Reserved for Dr. Ibrahim Abou-Saad: If in the textile markets we know that two brands, X and Z, are substitutes. Suppose that the supply of X increases and, at the same time, the supply of the Z decreases. Other things being equal, what would be the expectations for the change in the equilibrium prices at the two markets? The equilibrium price of Z will increase and the equilibrium price of X will remain the same. The equilibrium price of X will increase and the equilibrium price of Z will decrease. The equilibrium price of Xawill increase and the equilibrium price of Z will remain the same. The equilibrium price of Z will increase and the equilibrium price of X will decrease