Which of the following statements is true?
A) An explicit cost is an actual cost; an implicit cost is a theoretical cost.
B) Economic costs include both explicit costs and implicit costs.
C) An explicit cost is more important, dollar for dollar, than an implicit cost.
D) Explicit costs are accounting costs, not economic costs; implicit costs are economic
costs, not accounting costs.
Medical research that ends in a cure for a serious disease produces positive
externalities. What is the impact of this positive externality on economic efficiency?
A) At equilibrium, less than the economically efficient quantity of medical research is
produced.
B) A deadweight loss occurs because at equilibrium the marginal social cost of medical
research is greater than the marginal social benefit.
C) At equilibrium, more than the economically efficient quantity of medical research is
produced.
D) A deadweight loss occurs because at equilibrium the marginal social cost equals the
marginal social benefit.
Which of the following is a reason why it is difficult to estimate the extent of economic