Sammy, a drummer in a local band,and Dean,a librarian ata local university, share a condo in San Diego.Sammy enjoys playing his drums at home, and Dean enjoysreadinginsilence.DeaniswillingtopaySammy$125ifhewillstopplaying drums at home.Sammy is willing to pay Dean $75 per week to find somewhere else to read in silence.

• IfDeanhasthepropertyrighttoreadinsilence,whywillthehousebefreeof drumming?
• IfSammyhasthepropertyrighttodrum,whywillthehousestillbefreeof drumming?