1. River protection and CBA. Consider that the equations of the MCs and MBs schedules of figure 1 are given by P=2.5+0.5Q and P=10Q respectively, where Q is in [km] and P is in [thousand CHF per km]. Assume there are three options being discussed with local communities to protect the river i.e a) 4km, b) 5km or c) 6km of preserved river. Calculate total costs, total benefits and the net social benefit in each case. Which case corresponds to static efficiency? Why?