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In page Worker cooperative:

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According to Virginie Perotin's research which looked at two decades worth of international data, worker cooperatives are more productive than conventional businesses[1]. Another study by The Democracy Collaborative found that in the US, worker cooperatives can increase worker incomes by 70-80%.[2] One 1987 study of worker cooperatives in Italy, the UK, and France found “positive” relationships with productivity. It also found that worker cooperatives do not become less productive as they get larger. One 1995 study of worker cooperatives in the timber industry in Washington, USA found that “co-ops are more efficient than the principal conventional firms by between 6 and 14 percent”.[3]