Which of the following statements about public goods is correct?

Choose one answer: 1. public roads are always public goods at the same time. 2. a market for public goods is usually characterized by monopolistic competition. 3. public goods are usually subject to undersupply if the government intervenes. 4. public goods are always provided by state-owned enterprises. 5. free-rider behavior causes the quantity supplied of a public good to be greater than the efficient quantity in the absence of government intervention.

!! Answer 1 is wrong !!