The point is that in, for example, a car factory the employer owns the cars (positive) and makes the relevant contracts with the input suppliers (negative). The employees are jointly de facto responsible for using up the inputs to produce the cars. By the moral principle that legal responsibility should be assigned in accordance with de facto responsibility, the workers in the firm should jointly be assigned the legal claim to the produced cars and hold the liabilities to the input suppliers.
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The point is that in, for example, a car factory the employer owns the cars (positive) and makes the relevant contracts with the input suppliers (negative). The employees are jointly de facto responsible for using up the inputs to produce the cars. By the moral principle that legal responsibility should be assigned in accordance with de facto responsibility, the workers in the firm should jointly be assigned the legal claim to the produced cars and hold the liabilities to the input suppliers.