Absolutely brilliant, I want to read a whole novel on this!

Of all services most likely. If you swapped bodies with a stranger you have no idea what they even do for work for at least most of the first day. So the entire population wouldn't show up for work.

Then once people figure out what happened it'll be a toss up over 1) how to get back home in your new body, 2) wait until some scientists fix it, or 3) living life as this new person. Most people would not choose 3 I don't imagine, and even those that give it a go wouldn't have any of the skills/experience to actually do the new persons job.

I imagine most people would try to find their loved ones and wait till see how we switch back.

I like this one a lot. It's interesting and vague enough to let writers be creative