> stock is partial ownership
This is a nice idea, but it's not immediately obvious it should mean anything. If someone owns 1% of a company they may theoretically own 1% of its assets, but if they can't practically make use of those assets for personal benefit then that value evaporates.
Say I'm the director of a company. I own all of its shares and am the one-member board. As chairman of the board I appoint the CEO (myself) and in tandem with said CEO I make all decisions regarding hiring and pay. My company pays no dividends, and I've made it clear that I will never sell more than 49% of the company.
Now, the 49% that I might sell technically confers partial ownership, but it gives no control, no dividends, no benefit of any kind.
Say my company only does one thing: It invests in Company2, my other business. Company2 is run in exactly the same way as the first company of mine. Now, say I was willing to sell you 49% of the first company, and my first company (me) was also willing to sell you 49% of Company2. You'd own nearly 75% of Company2, but you'd have no control over anything.
I could keep nesting companies inside other companies until you effectively owned 99.9% of the company that did the actual work, but that's completely irrelevant - even if the company was worth billions, there is no logical reason that the value of those shares should be correlated with the value of the company. They might as well be correlated with the weight of the CEO, though they should probably be worth nothing at all.
I'm pretty sure partial ownership is only worth anything when it is relevant to a credible possibility of controlling ownership.