Answer:
only House Depot would gain surplus by supplying hammers to the market.
Step-by-step explanation:
In a competitive market the interaction between supply and demand determines the equilibrium price. An efficient firm can obtain surplus when it supplies the product at a price below the equilibrium price. In this case, only House Depot would have a surplus of $ 3 as it is able to supply the hammer at $ 7 but the market price is $ 10. Lace Hardware would not have a surplus because its price is identical to the market price of $ 10. Bob's Hardware Company is the least efficient and tends to take losses and exit the market as it is only able to sell the hammer for $ 13 while the market price is $ 10.