[Hyena]

<I>This isn't possible. A person can either spend money or store money.</I>

This isn't quite accurate. You note later how markets work, but you're not seeing how much that's in tension with wealth concentration. At its furthest end, you simply have a private person in charge of a command economy. Look at countries considered "kleptocratic": most aren't klepto- anything, they literally possess most of the wealth and thereby direct development towards their families in a sort of feudal way. Most could probably forgo formal taxation altogether and my impression of compliance is that they essentially do.