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 about one-half. If you have twenty dollars in gold it is only of half the value of twenty dollars twenty years ago. It contains only half the labor.

In the same way we may determine the value of laboring-power. "Like every other commodity its value is determined by the quantity (or time) of labor necessary to produce it.

"The laboring-power of a man exists only in his living individuality. A certain mass of necessaries must be consumed by a man to grow up and maintain his life. But the man, like the machine, will wear out, and must be replaced by another man. Besides the mass of necessaries required for his own maintenance, he wants another amount of necessaries to bring up a certain quota of children that are to replace him on the labor market and to perpetuate the race of laborers… It will be seen that the value of laboring-power is determined by the value of the necessaries required to produce, develop, maintain and perpetuate the laboring-power." (Value, Price and Profit, pp. 75-76.)

The value of a man's labor-power is determined by the social labor necessary to produce it, Marx says. This means food, clothing, shelter (the necessities of life) and it means something additional to rear a boy or girl to take your place in the shop or factory when you grow too old to keep up the fierce pace set by the boss.

Enough to live on and to raise workers to take our places—this is the value of our labor-power, if we are wage-workers.