In the capitalist system the workingman cannot work for himself, as in the old days. He cannot compete with the big manufacturers. So, if you are a workman, you must find an employer. You work for him; that is, you give him your labor for so and so many hours a day or week, and he pays you for it. You sell him your labor power and he pays you wages.
In the capitalist system the whole working class sells its labor power to the employing class. The workers build factories, make machinery and tools, and produce goods. The employers keep the factories, the machinery, tools and goods for themselves as their profit. The workers get only wages.
This arrangement is called the wage system."
What Is Communist Anarchism by Alexander Berkman