Which one of the following occurs when the marginal private benefit or cost of goods and services are adjusted so that the users consider the actual marginal social benefit or cost of their decisions? O a Internalization of an externality b. Corrective tax oc. General theory of second best Sophisticated consumer d. Which one of the following is the extra cost to third parties resulting from the production of another unit of a good or service? O Research paradigm cost b. Descriptive Research cost Oc Interpretivist cost od Marginal external Cost Which one of the following must exists for a perfectly competitive market system? a. All productive resources are privately owned Resources are mobile and may be freely employed in any enterprise b. OG All relevant information is freely available to buyers and sellers