Who said "Labor power is, therefore, a commodity which its possessor, the wage-worker, sells to capital. Why does he sell it? In order to live. But the exercise of labor-power, labor, is the worker's own life-activity, the manifestation of his own life. And this life-activity he sells to another person in order to secure the necessary means of subsistence. Thus his life-activity is for him only a means to enable him to exist. He works in order to live. He does not even reckon labor as part of his life, it is rather a sacrifice of his life." ?

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