1. _The self-employed laborer earns wages in the broad economic sense._ In this sense the isolated workman, Robinson Crusoe on his island, earns wages, but these wages could not be measured at all exactly. They are a part of an indivisible income, and there is no way to determine how much should be attributed to the uses of the wealth employed and how much to the labor. The independent farmer, producing on his own farm nearly everything he consumes, may be said to earn wages in the broad sense. These can, moreover, be estimated, because they can be compared with what he could get by working for some one else. The farmer, therefore, attributes a certain part of his income to the farm as rent and a certain part to his own labor as wages. [Sidenote: Wages of the self-employed exchanging worker] 2. _The wages of self-employed labor are often simply the value of the material product it secures by exchange._ Labor has value indirectly because embodied in products. The worker value of these products is reflected to the labor which secures them. The wages of the fisherman day by day, as he follows his vocation, are simply the market value of the fish he catches day by day. The gold-miner, working with simple tools in the days of placer-mining, earned wages exactly expressed by the gold he washed out. The independent worker with few tools does not think of attributing any considerable part of his income to his tools. The umbrella-mender's "kit" is so small that his true wage is little less than his total receipts. The tinker, the shoemaker, and the tailor, who went from house to house in the old days, thought only in the vaguest way of marking off from their incomes a part to be counted as the rent of their little outfit of tools. Until very recent times the capital invested in tools commonly was small, and usually was owned by the handworker who thus received an undivided income, of which wages were by far the larger part. It was inevitable, therefore, that labor alone should have been thought of as the cause of the value of goods produced by the artisans in the towns and cities. This error, small at first, was magnified as the capital investment of modern industry grew, and it persists in many fallacious notions that still taint modern economic theory. [Sidenote: Both impersonal and personal causes of contract wages]