If a) the government uses a tradable permits program for pollution emissions, b) polluting firms are heterogeneous in terms of their marginal abatement costs (MACs), and c) each firm is initially allocated an equal amount of permits, it must be the case that: Question 13Select one: a. Firms with higher marginal abatement costs will pay firms with lower marginal abatement costs to abate more. b. Firms with lower marginal abatement costs will end up with more permits than firms with higher marginal abatement costs after trading. c. All firms will end up abating the same amount of emissions. d. All of the above are true. e. All of the above are false