Suppose Your Town Wishes to Build a Dam to Protect

Essay

Suppose your town wishes to build a dam to protect itself from the risk of flooding.Despite the fact that each family in the town is willing and able to pay up to $200 to have the dam built and it will cost only $150 per family,a voluntary contribution campaign is unable to raise enough funds to build the dam.Why? What type of problem is this,and what solution would you recommend?