
Opportunity cost; comparative advantage; consumer surplus: While unclogging the sink, the father realizes he is late for a meeting. His son volunteers (for $50) to fix the sink rather than his father hiring a plumber. The father agrees and he admits he would have paid more.
DVD Location: Season 1, "Mascot Love", 3:13-4:29

Trade-offs; opportunity costs: A man discovers he has a brain tumor. Surgery is available, but only at the great risk of the patient losing his memories and personality. However, without the surgery, the patient will not have very long to live.
DVD Location: Season 1, "No Man's Land", 22:36-24:00 and 26:57-27:34 and 29:57-31:27

Common resource problem and overconsumption: Monica decides to make home-made candy and leave it by her door in order to make friends. Her "neighbors" eventually begin treating the candy as a common-pool resource good and overconsumption occurs.
DVD Location: Season 7, episode 9, 02:01:02:41, 04:37-05:19, 10:48-11:47 and 19:24-20:49

Diminishing marginal utility, marginal benefit vs. marginal cost: One day Joey and Chandler find a free porn station on their cable television. The building superintendent tells them that when this happened to him he turned off the TV and the porn was gone. So the guys decide to leave the TV on the channel 24/7 just to be safe. Throughout the episode the porn channel is in the background. Finally, at the end of the episode the guys grow tired of the porn and they decide to turn it off.
DVD Location: Season 4, episode 3, "The One with the Free Porno", 0:22-1:22 and 22:30-23:30.

Incentives, personal finance: Cliff is upset that his son doesn't want to go to college. He uses monopoly money to show him how life's expenses add up. The last scene shows Cliff threatening his son, providing him an incentive to do as his father tells him.
DVD Location: Season 1; 9:12-12:17 and 16:42-18:14





























