But, on the other hand, whatever lessens or threatens to lessen this natural and most beneficial stress of competition among producers of similar commodities at home or abroad, necessarily lessens the motive on the part of these producers to excellence of quality in their goods and to cheapness of their cost, because it makes less the diversity of relative advantage as between these producers and those producers of other commodities against which the first exchange. The units of advantage that would otherwise be divided between the exchangers are diminished; the motives to trade and the rewards of trade are thus lessened to each pair of parties subject to such diminution of competition, and consequently to the community, or nation, or family of nations, as a whole; and accordingly this is the precise place for us to look into the nature and effects of _Monopoly_, so called, and to perceive once for all, that Monopoly is the enemy of mankind. Monopoly is a word derived from two Greek words, which mean when combined _selling alone_, that is, the privilege of selling one's commodity free from the competition to which it is naturally subject by other sellers than the privileged one. Monopoly is thus artificial restraint imposed on some buyers and sellers for the supposed benefit of other buyers and sellers. It is wholly unnatural. It is usually enjoyed under the forms of law. Its beneficiaries commonly cajole or extort from Government by hook or by crook the exclusive privilege of selling certain commodities in a designated market. Their motive is purely selfish: it is simply and solely to get for themselves a return-service artificially enhanced by selling commodities in a legally restricted market. The effect in the first instance usually corresponds to their expectations. The public are at their mercy so far as the designated commodities are concerned.