Calculate the MPC.

________ Treasury bonds tend to have lower interest rates than ________ Treasury bonds

A) Lower coupon payment; higher coupon payment B) Higher denomination; lower denomination C) Longer-maturity; shorter-maturity D) Shorter-maturity; longer-maturity

Dumping raw sewage into Boston Harbor is an example of

a. a negative externality b. a positive externality c. a private cost d. a sunk cost e. an inverse cost