Hmm. So, I think you're struggling to understand how those two things are connected.

First off, when we talk about "hoarding wealth", yes, we're including assets in that. No one here is saying that Elon has 900 billion dollars in a big old Scrooge McDuck vault. Obviously it's all tied up in shares, bonds, real estate, etc. That makes it technically less liquid, though in practice those issues are largely irrelevant, because a) as I was pointing out in my previous reply, what the ultra-wealthy spend is such a small fraction of what they own that in practice they rarely need to dip into their less liquid assets, and b) because even larger purchases can be handled by simply taking on very cheap debt using those same assets as collateral. Basically, your credit card runs at 20%, Elon's runs at 2%.

More to the point, that huge hoard of assets is the problem. Because their ability to buy up investments (including things that really shouldn't be investments, like housing) makes those things more expensive for the rest of us. They can buy all the housing and rent it back to us, instead of us actually being able to afford homes.

But ultimately talking about spending habits is the answer to your question, because those raw differences in what people spend versus what they make account for huge differences in how much of our wealth we can afford to hold onto. The fact that that wealth is stored in assets rather than a bank account is completely immaterial. Or, rather, it is material, but only further proves my point.

Think about it this way; Elon can afford to have 99.9% of his wealth tied up in assets where he cannot immediately access it, and can still live a life of luxury most people couldn't imagine in their wildest dreams. Do you think the average 9-5 worker could afford to receive even 90% of their pay in the form of assets rather than money? Or would they just be selling those assets immediately to cover their daily costs? That, right there... That's the problem.