If the demand curve for wheat in the United States is
P=12.4 - Q_D
where is the P is the farm price of wheat (in dollars per bushel) and Q_D is the quantity of wheat demanded (in billions of bushels), and the supply curve for wheat in the United States is
P= -2.6 + 2Q_S
where Q_s is the quantity of wheat supplied (in billions of bushels), what is the equilibrium price of wheat?
What is the equilibrium quantity of wheat sold? Must the actual price equal the equilibrium price? Why or why not?