16–12
57. Sadie is getting ready to go to work where she earns $70 a day as a day laborer. Her friend Caroline
calls her and asks her to go swimming with sharks for the day. Sadie decides to go with her. Sadie’s
choice implies that her opportunity cost of working is:
58. Claire is on her way to her job at a call center where she was planning on spending three hours. She
can drop in and work any hour she wants to and earn $12 per hour. Her friend calls and invites her to
spend the next three hours bungee jumping. Claire decides to go with her friend, which tells us Claire’s
opportunity cost of working for three hours is:
59. Grace is headed to work at a catering business as a waitress for $100. Her sister Paige calls and
asks her to go horseback riding instead. Grace decides to go to work, which implies Grace’s opportunity
cost of working is:
60. Eli is headed to his job harvesting grapes at a local vineyard. He earns $8 every hour he works there.
His friend calls him and asks him to go mountain biking for the next 2 hours instead. Eli cannot decide
between the two activities. His indecision implies he values riding his mountain bike for two hours:
61. Eli is headed to his job harvesting grapes at a local vineyard. He earns $8 every hour he works there.
He could also earn $7 an hour working as a bagger at the local grocery. Assuming Eli can only choose