* Q17. Lots of people pay high fees to join a gym in early January, and then fail to work out more than a few times. Does this evidence provide support for or against the sunk cost bias? Explain your reasoning.

Q18. Economist Dean Karlan has opened stickk.com, a nonprofit entity that he calls a "commitment store." Individuals attempting to achieve a goal (to lose weight, to quit smoking, to write daily in a journal, etc.) authorize stickk.com to charge them a prespecified amount if they fail to reach their goal (as determined by a third-party referee). Should they fail, subscribers are given the option of donating the fees to a charity they support or to an organization that they despise. Why might allowing the subscribers to direct their losses to a favourite charity weaken their resolve?