You Are the Mayor of a Small Town with 2000

You are the mayor of a small town with 2000 residents.The head of your economic development agency recently conducted a survey in which the 2000 residents said that a public concert in the centre of town would be worth $20 to each of them.Since it costs only $5000 to hold the concert,you organized and held the concert,which everyone in town enjoyed.But when you asked for donations to pay for the concert,you only collected $30 in total.What do you know

A) The survey certainly overstated how much the concert was worth to each resident.
B) From the standpoint of total costs and benefits, the cost of the concert certainly exceeded the benefit.
C) The concert was an example of the Tragedy of the Commons.
D) Residents of the town were probably free riders.