John can reduce his pollution at $300 per ton of carbon dioxide and Jill can reduce her pollution at $250 per ton of carbon dioxide. Which is more likely to be efficient? Multiple choice question. Tax incentive program because it is more efficient for John to reduce his consumption and Jill to internalize the externality. Direct regulation because it is more efficient for Jill to reduce her consumption and John to internalize the externality. Direct regulation program because it is more efficient for John to reduce his consumption and Jill to internalize the externality. Tax incentive program because it is more efficient for Jill to reduce her consumption and John to internalize the externality