If co-ops are an effective corporate structure, why are they not more prolific? I am sure that many people would like to work in co-ops, so the question is why

If co-ops are an effective corporate structure, why are they not more prolific? I am sure that many people would like to work in co-ops, so the question is why there are not more of them. I would suggest that co-ops don't work very well, and that if they did, employees at shareholder and closely-held corporations would found more of them. From the examples of co-ops that I have examined, it seems that they often fail from internal politics; this is true for both companies which are bought-out by employees, and those founded as co-ops. The examples that I've looked at are only anecdotes, and I do not have a list of citations, but I'd be very interested to hear from anyone who has found differently (as I have no prejudice against them).