the following questions regarding public goods. a) What is meant by "free-riding"? Explain. b) Would free-riding lead to an under-provision or over-provision of a public good? Explain. c) A possible solution to protecting wild species is for conservation groups to ask for contributions. Discuss why this approach may not be effective in providing the socially-optimal level of protection for wild species? d) Come up with one example other than the use of natural resources where you see incentive for free-riding to occur in the world around you. Does it give rise to optimal outcomes