Science Fiction has always shaped reality. Tablets were predicted by Star Trek, Hitchhiker’s Guide to the Galaxy, and many more. Mashable even published a list of sci-fi books that predicted future events. I’m not implying that theses people posses some special skill, but rather that society follows ques. Science fiction writers happen to be particularly adept at telling what science may actually do in the near to long term future.
In one specific case many sci-fi games & movies have currencies that are defined by “credits” or “units”. Theses terms both represent possession, rather than wealth. Some of these movies include: Total Recall, Demolition Man, Judge Dredd, Babylon, Battlestar Galactica (“cubit”), Farscape, Ender’s Game, Deus Ex, Mass Effect.
If possession is the only measure of wealth cryptocurrency becomes the only solution. An individual can possess and hide a private key much easier than a similar amount of cash.
And for the haters: Wealth and possession are two very different concepts. Wealthy people are almost never in possession of their wealth.