試題詳解

10. Which of the following statements best describes the concept of commitment device?
(A) A student announces through social media that he will contribute to charity every time he gets a grade lower than B− and publish the receipts online.
(B) A country leader announces the new policy of fighting corruption through increased fines for corrupt officials.
(C) An investor buys treasury bonds.
(D) The price of ice-creams increases after a surge in demand.