Kate and Ali Can Live Together a Two-Bedroom Apartment for $600

Multiple Choice

Kate and Ali can live together a two-bedroom apartment for $600 per month, or they can each rent a one-bedroom apartment for $400 per month. Apart from the rent, they are indifferent between living together and living apart, except for one problem: Kate hates Ali's taste in music. Kate would be willing to pay up to $100 a month to avoid hearing Ali's music. Ali would give up listening to her music for no less than $300 per month. If Kate and Ali decide to live together, is it socially optimal for Ali play her music in the apartment?

A) Yes, because the benefit to Ali of listening to her music is greater than the cost to Kate.
B) No, because the benefit to Ali of listening to her music is less than the cost to Kate.
C) Yes, because the benefit to Ali of listening to her music is less than the cost to Kate.
D) No, because the benefit to Ali of listening to her music is greater than the cost to Kate.