I'm curious why you think this is the case. It's close to impossible (good luck convincing people to devalue their money) to increase the Bitcoin supply other than through minig.
I know write you an IOU for 1 bitcoin, and you buy a car with that IOU, because anyone who owns that IOU can come to me and get their bitcoin, and everybody knows that I am good for my money, because that is the whole condition of this thought experiment.
I now write another IOU and give to my uncle, who buys a house with it, because everybody knows I'm good for it.
Now the money supply has increased, without minting new bitcoins, and this is exactly what happened to gold (which, as you know as well as anybody, you can't just print)