Calculate the equilibrium price and equilibrium quantity.
The market demand and supply functions of copper are as follows: QD = 10 -50PC + 0.3I + 1.5TC + 0.5E where: QD = quantity demanded of copper (millions of pounds) PC = price of copper ($ per pound) I = consumer income index TC = telecom index E = expectation index QS= -86 + 90PC â?" 1.5W + 0.5T + 0.4N where: QS = q