If this is a truly capitalistic society - what should really happen is that all the bought back stock needs to be reissued (sold back) into the market — but that would create excess supply, reduce price, then freak out everyone’s 401k.
Finance is a crazy web and really cool - but massively complex. So you are right that there is liquidity every day, but that liquidity does not affect the total number of publicly traded shares until the purchaser is the corporation itself (the buy back).
The real screwed up compounding variable in liquidity is who is actually buying (awesome when it’s actual primary investment aka private fundings and ipos, and messy when it’s the secondary market aka the ticker price) — guess what’s even more messy: Passive Funds like ETFs. Passives (where 401ks live) are now the primary vehicle of investment for average America so really no individual investor is actually buying an individual stock- instead you buy a ‘share’ in a prorated basket of stocks based on ratios set in investor agreements (vanguard ishares etc).
When money goes into the ETF, the fund buys 10% x, 10% y... so on of the basket of stocks they market. No earnings have changed, no cash flows, but external secondary market forces now drive the market.
This is what Michael Barry (of the Big Short) is waiting for next - along with Water, which will be the next decades issue.