In general as the unit price of a commodity increases the demand for that commodity decreases Also as a commodity s unit price increases the manufacturer normally increases the supply The point where supply is equal to demand is called the equilibrium point Find the number of DVDs and the price per DVD when supply equals demand The number of DVDs is The graph below shows the demand and supply equations for previously rented DVDs Q Q Cost of a Previously Rented DVD 26 24 22 20 18 16 14 12 10 0 Demand Supply Equilibrium Paint 1 2 3 Number of DVDs in thousands