In French construction coops, capital productivity is double the norm. The democratic firm can produce two buildings while the capitalist firm produces only one. The reason for this increased productivity is that in a democratic firm the workers supervise each other while in capitalist firms they cover each other's theft or poor work. In GM you will be called a pig if you expose a theft by a fellow worker. Then there is the savings of materials.
Capitalist firms invest in a lot of unnecessary machinery.
They replicate the inclination of the average Americans buying things they don't need. The democratic firm can adjust to the optimum level of intensity. Productivity is not measured only in dollars and output but also in happiness and job security. Job security is more important than whether you earn three or four or five hundred dollars a week. In fact, one of the main theoretical and practical characteristics of the cooperative system is job security.