At the beginning of Chapter 4 it is argued that "trade-off" exists between damage and control costs. Furthermore "from an economic viewpoint, a dollar's worth of investment (expenditure) on pollution-control technology will make sense if, and only if, society is expected to be compensated by the benefit to be realized from the avoidance of environmental damage that is worth more than a dollar." Is this statement consistent with the condition for the optimal level of pollution; that is, MDC= MCC. Explain.