10. According to an economist, a price floor (x) is desirable because they make markets more equitable as well as more efficient. (y) will cause a surplus to persist if the floor is binding, since price cannot adjust to a lower price. (z) is a binding constraint on the market if the equilibrium price is below the price floor. A. (x), (y) and (z) B. (x) and (y) only C. (x) and (z) only D. (y) and (z) only E. (y) only