Sure, I get they want to beat the drum on wealth inequality, and perhaps that's a drum worth beating. But its a disingenuous disservice to pretend that these people are sitting on a massive pile of 'hoarded' liquid cash that could be redistributed in a meaningful without incurring massive losses. Might as well pretend that we could seize and sell all of the latest $100bn shitcoin and get $100bn USD to distribute.
The stock market is only liquid at smaller scales, bigger transactions will have dramatic effects on the price.
You are right that insiders selling can be a signal. That's why we have laws that govern their actions. But that's because it is assumed Gates knows more than the average MSFT investor.
Yes, if Bezos woke up tomorrow and wanted to crash AMZN by selling his shares, he could. But he routinely liquidates over a billion dollars worth a quarter.
"By definition"? Which definition are you using?
Liquidity exists on a spectrum and is not binary:
> In business, economics or investment, market liquidity is a market's feature whereby an individual or firm can quickly purchase or sell an asset without causing a drastic change in the asset's price. Liquidity involves the trade-off between the price at which an asset can be sold, and how quickly it can be sold. In a liquid market, the trade-off is mild: one can sell quickly without having to accept a significantly lower price. In a relatively illiquid market, an asset must be discounted in order to sell quickly.[1][2]
But if he wants to buy a sports team, he can probably pay directly in AMZN stock as a private transaction (well, except for possible SEC regulations.)
But, it is not the value that is liquid, necessarily. It is just the stake. In theory, there is intrinsic value to this. In practice? Much more complicated.
The day to day fluctuations may be relatively meaningless, but the amount of wealth controlled via it is very real.
The popular understanding of capitalism is accurate prices and liquid goods, and only a few things (as contested in culture wars) are genuine separate axis. The reality is the real power of the billionaires isn't in their "net worth" (however good the accounting is), but in their power over the institutions they control. Look at the size of the flow in and out of those institutions, their capacity for investment. Realize also that even as we collectively have the wealth for much simultaneous investment, earlier investment has a profound and non-erotic effect on future history (e.g. car vs public transit, Unix being entrenched for 50+ years, etc.) This is the real travesty of billionaire power, not the ability of Bezos to buy big yachts or whatever.