the socially 3. A negative externality will result in an equilibrium quantity of an activity that is optimal quantity a. above b. below C. above or below D. equal to E. it cannot be determined 4. People can purchase and sell the right to perform activities to perform activities that cause externalities to arrive at efficient solutions. This describes.... a. the Tragedy of the Commons b. a positional externality C. an external benefit D. the Coase Theorem E. the problem of unpriced resources