A childhood belief about in the street

I remember going to see the house my family was moving into. As I was sitting in the car on the way to the house, I started thinking about people moving and for sale signs and the like. I asked where the other people went who were in the house before us, and my parents told me they had moved to a new house too. I didn't know much about money at the time, so logically I concluded that people trade houses.

I could see the full coordination as one family talked to another and arranged what home to go to, and would all move on the same day into thier new place.