One great theme of the post-2008 financial world is that money is a social construct, a way to keep track of what society thinks you deserve in terms of goods and services. That has always been true, but modern finance has made it more obvious. I think that 15 years ago it was easier to think that money was an objective fact. Money is a kind of stuff, you might have thought, stuff with some predictable value that you can exchange for goods and services, and you can acquire a quantity of it and then you own that money and can use it however you like to buy things.