Dominic is willing to pay $12 for a single pizza; Stephany is willing to pay $7; and Tyler is willing to pay $5. There are no other potential consumers for pizza. Cheezbuzz, the supplier of pizza, has a cost of $1 for the rst pizza, $2 for the second pizza, $3 for the third, $4 for the fourth, and so on. In a closed market equilibrium, the social surplus will be $ 18 . If the world price is $10.50, a total of 9 pizzas will be exported. If the world price is $2.50, the social surplus will be $ . (Round your response to the nearest penny.)