Suppose science (or some other area) develops a way to switch minds relatively easily and with negligible risk to one's life; how would the world change, and how different would the possible worlds be depending on:

* Cost of transfer and machinery (restricted to rich? accessible to most but not readily? no cost once you buy a specific machine? no money required at all?)
* Legislation (consent? heavy restrictions?)
* Would consent be required for the transfer? (could body mugging be a thing?)
* Required facilities & speed (would it require days in hospital or just take a second or two?)
* Restrictions on returning to old body (perhaps one cannot use any body twice?)
* Would bodies have to be nearby, or could long-distance transfers be made?

I presume that either way one would end up with bodies being sold. But would there be rentals? Would one have, instead of today's personal trainers, people who would switch bodies with you for a couple of weeks and exercise furiously? Would possessions be linked to mind or body, and if mind, how would people prevent identity theft? How would people treat their nearest and dearest switching bodies? Would there be false accusations of switches?