Yes, as djokkataja points out, and as I pretty clearly alluded to in my post - it's not an assumption. These structures exist and are successful. They are successfully competing in the global markets against more traditional hierarchical corporations.
Mondragon is the canonical example of this working at scale, but there are many others. A more familiar name, if you're in the United States, is Equal Exchange - you may have come across their coffee and chocolate at Whole Foods. There are many, many, many smaller ones (housing cooperatives, small cooperative cafes, collectives, and so on).
They are more common than most people realize, but still rare enough that the vast majority of people probably won't have had experience with successful ones.
Mondragon is the canonical example of this working at scale, but there are many others. A more familiar name, if you're in the United States, is Equal Exchange - you may have come across their coffee and chocolate at Whole Foods. There are many, many, many smaller ones (housing cooperatives, small cooperative cafes, collectives, and so on).
They are more common than most people realize, but still rare enough that the vast majority of people probably won't have had experience with successful ones.