3. _A monopoly often seeks to avoid a general market price, and it adjusts its charge in each small market separately._ This is a most important aspect of the monopoly problem and a most important modification of the principle just stated. A market price is the expression of the least urgent demand that aids in carrying off a given supply. It is a maxim that there can be but one price at a time in a given market. The baker ordinarily sells the loaf at the same price to every one buying a given quantity. If he had a monopoly of the bread-supply, however, he might deal with each customer separately, ascertain, by personal inquiry into the lives of the citizens and by the aid of a force of detectives, just how much each could or would pay rather than do without bread. The policy of varying prices is thus followed by monopolies, though usually in a less inquisitorial way, to enable them to get the highest possible returns. Under the name of "charging what the traffic will bear," it is practiced by the railroads as local and personal discrimination. The endurance of some communities and of some individuals being greater than that of others, the burden is adjusted to the back, being made not as light but as heavy as each can be forced to bear. [Sidenote: Low rates to destroy competitors] Large monopolies dealing in commodities use an adaptation of this method to kill off small competitors who, within a certain district, sell at less than the monopoly price. Prices are suddenly reduced in that community below cost until, the small competitor being ruined, the monopoly rate is reëstablished perhaps higher than before. Fear of suffering a like fate prevents others from attempting competition even when prices offer a great attraction and give a high monopoly profit. [Sidenote: The source of monopolistic profits] The profits of monopoly can be explained by the ordinary laws of value, yet evidently they form a peculiar economic and social problem. They appear to be due not to the services of the enterpriser in increasing production, but to his success in limiting it. There is, therefore, an antisocial element in them not found in the profits of ordinary industry. This deserves further and closer study. CHAPTER 34 GROWTH OF TRUSTS AND COMBINATIONS IN THE UNITED STATES § I. GROWTH OF LARGE INDUSTRY IN THE UNITED STATES [Sidenote: Distinction between large capital] [Sidenote: Large production] [Sidenote: And monopoly]