A tax on the sellers of coffee mugs a. increases the size of the coffee mug market. b. decreases the size of the coffee mug market. c. has no effect on the size of the coffee mug market. d. may...

A tax on the sellers of coffee mugs a. increases the size of the coffee mug market. b. decreases the size of the coffee mug market. c. has no effect on the size of the coffee mug market. d. may increase, decrease, or have no effect on the size of the coffee mug market.