Money can be "lost", and "created". In fact, it regularly is by commercial banks; this is the cornerstone of the modern economy. The bank of England wrote a pretty accessible document on money being created and destroyed [1]. For a slightly deeper dive (but equally accessible) check out "Can’t We Just Print More Money?" by Rupal Patel, et al. [2] which describes the different kinds of money.

The 2014 doc was a pretty wild read for me when it came out - it changed my perspective quite a bit.

[1]:https://www.bankofengland.co.uk/-/media/boe/files/quarterly-...

[2]: https://www.goodreads.com/book/show/58796370-can-t-we-just-p...