Phil wants to ride his street strider, but his whole family thinks it is very uncool. Luke points out that he has friends on the street that might see, and Claire not so subtly threatens to leave him if he rides it suggesting she is not getting any joy from him enjoying his street strider and in fact it is harming their relationship. While Phil derives private benefits from the StreetStrider (like living healthier), he is also imposing social costs on his family. Given that his impact is relatively localized, the Coase Theorem would suggest that the Dunphy family can come to an agreement about whether Phil can keep his bike.
See more: Coase Theorem, externalities, external costs, negative externalities, private benefits, social costs
After a successful trip to Vegas, Jay decides to purchase a dog butler statue as a gift for himself. He thinks everyone loves it, but Gloria detests it and tries to get rid of it. Every time she comes home, she’s reminded of the dog and it ends up scaring her. While Jay clearly receives private benefits from his purchase (and he also thinks there are social benefits), Barkley has imposed an external cost on Gloria, which Jay has clearly not considered.
The Coase Theorem would suggest that if Gloria is truly unhappy about Barkley, she could arrange some form of payment to get Jay to put him away. We learn later that the fight between them was enough for Jay to recognize that he’s imposing a cost on Gloria, and instead decides to get rid of the butler.
See more: Coase Theorem, external costs, externalities, negative externalities, preferences, utility
Phil has a pair of slippers that Claire isn’t too fond of. While they bring private benefits to Phil in the form of comfort and easy jokes, it imposes a cost on Claire. Under the Coase Theorem, we’d suspect that Claire could pay Phil to stop wearing them or Phil could pay Claire to let him keep wearing them, but Claire has instead opted for a creative (and often illegal…) way to dispose of Phil’s possessions that she does not like.
See more: external costs, externalities, negative externalities, subjective value, tastes and preferences