The interest rate that banks charge other banks for loans is the

In a competitive market where the elasticity of the market demand curve is -1.5, the number of firms is 20, and an individual firm faces a residual demand curve with an elasticity of -68. What is the elasticity of the supply curve?

A) 0.5 B) 1.2 C) 2 D) Cannot be determined.

If parking spaces on a college campus are scarce, with quantity demanded during the "peak" hours, from 8 a.m. to 11 a.m., far greater than the number of spaces, an economist would propose as an efficient solution,

a. lowering the parking fees during those hours to compensate students for the longer search time. b. charging the same parking fees during all hours of the school day. c. raising parking fees during the peak hours to encourage some students to schedule classes during other hours when parking fees are lower. d. hiring more security guards to patrol for illegal parkers.