1> 6 million
The voters should choose the quantity where the marginal cost and marginal benefit are equal. So, it happens at 6 million of gallons which maximizes social welfare.
2> B
Since bureaucrats and people have different objective function where people want to maximize their net benefit whereas bureaucrats want to minimize cost within the budget constraint. So, it may lead to a non-installation of the efficient quantity.
o Marginal benefitmarginal cost dollars per person) MSC 120 The graph shows the marginal social benefit...