Residents of Brisbane live on the Brisbane River which is prone to flooding. Suppose there are two groups of residents who live near the river, the first 1000 (type A) people value building a dam for flood control but the other 1000 (type B) people do not. If we know that Type A Demand QD = 100 - P Type B Demand QD = 50 -P Where Q measures the quality of flood control. If the price of a unit of flood control is $100,000 and the citizens of Brisbane did not work together the amount of flood control purchased would be