Suppose the supply curve of boom box rentals in Golden Gate Park is given by P 5 0.1Q, where P is the daily rent per unit in dollars and Q is the volume of units rented in hundreds per day. The demand curve for boom boxes is 20  0.2Q. If each boom box imposes $3 per day in noise costs on others, by how much will the equilibrium number of boom boxes rented exceed the socially optimal number? LO1