Roughly 5 years ago I bought my first house. Before that I was renting a small apartment. Did I buy a house bigger than I needed? Yes I did. Single, 1 dog (which I got after the house), and I've got a 4 bed, 2.5 bath house. Yes, I've a bathroom I don't use, and is almost strictly for guests which I have twice a year or so. Now, granted, when I have out of state visitors, having the spare rooms comes in handy, but I don't "need" them.
Now, since I did this with my own money, and it would be wasteful in the eyes of Gaetan, why would I take possession of a smaller home for "free" than something I spent actual money on?
This is yet another flaw in Gaetans plan. The assumption that people will limit their wants because everything is available at no cost.
Also, I've 2 cars. Despite being limited to driving one at a time. One is a 2 door sports car, the other is a 4 door sedan. They serve different purposes, but to be fair, I really don't need the sedan all that often. I needed a car to pick up my parents and while I could have shoved mom in the back of the Camaro, I decided to get something nice. So I got a used Maserati. Also, I wanted, not needed, an exotic car.
How would being a society without currency lighten my modest consumption?