39. Which one of the following statements on the causes of the energy efficiency gap is correct? a. The likelihood of buying an energy-efficient refrigerator is higher if a consumer perceives a discount rate that is much higher than the market discount rate. b. Bounded rationality implies that consumers make decisions by comparing benefits and costs. c. The principal/agent issue points out the possibility that a tenant is likely to use more energy if the utilities are covered in the rent. d. If energy markets are not competitive there will be an energy-efficient gap. 40. Which one of the following statements on the rebound effect is correct? a. It is only due to an increase in income. b. It is the reduction in energy savings due to the implicit energy price decrease that occurs with an increase in energy efficiency. c. It has no effect on energy use. d. It increases savings in energy 41. Firms that benefit from economies of scale: a. Performs more efficiently when output is small. b. Would not be considered natural monopolies because MC = MR c. Prefer to operate under marginal cost pricing. d. Face declining marginal cost