Fiona shares an office with her exminus−husband. Her share of the rent and utilities is $625 per month. She is considering moving to a home office which she will not have to share with anyone. The home office will not cost her anything as far as extra rent or utilities. Recently, you ran into Fiona at the gym and she tells you that she has moved into her home office. Fiona is as rational as any other person. As an economics major, you rightly conclude that ______

As an economics major and a rational human being I can firmly state that Fiona is not only saving $625 per month in rent and utilities, but also on several different aspects of her life that will probably boost her productivity. She is not only saving money on the rent, she probably is also saving some money (and time) in transportation costs. Also she´ll probably save money on other expenses that are usually not considered important but can be significant, for example:

Food and beverages: it´s always cheaper to eat at home.
Clothing: if her work doesn´t require clients to personally visit her office, she can save money by wearing regular daily clothes instead of more fancy office type garments.
Etc.

Besides the previous advantages, not seeing and dealing your ex-anything again, as Mastercard said it, is PRICELESS.