I worked for a COOP grocery store in Arizona for two years best job ever. The Mars series by Kim Stanley Robinson has some great structures for COOPs. One of my favorite structures was an internship. You worked for a few years to earn a stake in the company. After a few years you owned that part and you could use it to buy into the next company you work at, then eventually retire with it. This is in a society built on a science outpost economy, where not even air is easily accessible, so most basic things tend to be already provided for. If you are interested there, I have an epub I got for free somewhere, there are also places called libraries. Robinson is always heavy on the sci in his fiction, any science he has a great viewpoint on it. I even really like his spiritual views, a living master.
It seems like a fine model, I just think we should make sure people are also free to try other models in case they work better. The great thing about capitalism is that the proof is in the pudding. If something doesn't work it'll fall apart unless something that works really well is propping it up.
Well of course it is fiction. It is a bit complicated, but the economy was mostly trading in the more rare useful minerals, plants, and soil. It was propped up by self replicating AI factories, that do not yet exist. Not that we can't look toward models in art to shape the future. What is propping up our current economy, oil subsidies, child labor in the third world, the government making a profit in young peoples student loans.... I might be the wrong person to play the it will never work game with, you might learn things. I'm happy either way.