No where in the public economy of a people are the workings of self-interest so apparent as in the determination of prices. When the price of a commodity is once fixed by the conflict of opposing interests,(601) the self-seeking of every individual dictates that he should thereby gain as much as possible of the goods of others, and lose as little as possible of his own. In this struggle, the victory is generally to the stronger, and the price is higher or lower, according to the superiority of the buyer or seller.(602) But who, in such case, is the stronger? Political or physical superiority can turn the balance one way or another only in very barbarous times, and especially in times when legal security is small.(603) As a rule, it is the party in whom the desire of holding on to his own commodities is strongest, and who is least moved by the want of the wares of others. As in every conflict, confidence in self, sometimes even unbounded confidence in self, is an important element of success. A party to a contract of sale or barter, who considers his immediate position decidedly stronger than that of the other party, will scarcely depart from his demands. Hence it is, that in exchange, one party so frequently holds back until the other has expressed his terms.(604) How different is the price of the same pieces of land which a new railroad enterprise is compelled to pay and the prices it would get for them, from the adjoining owners, in case of the dissolution of the company. But the struggle to raise prices or to lower them, which is always going on, undergoes modifications of every description among all really commercial nations, partly through the influence of the public conscience, which brands as inhuman and blameworthy the spoilation of the opposing party by acts which the laws do not reach. And this consideration by the public conscience is all the more severe in proportion as real competition in the article sold is wanting.(605) But the chief modification in this struggle is produced by the fact, that where civilization has advanced farthest, every commodity is offered for sale by a great many and wanted by a great many.(606) As soon as several seek the same object, there naturally results a rivalry among them, which induces each to attain the desired end, even by the making of greater sacrifices than others. The greater the supply of a commodity is, as compared with the demand for it, the lower is its price; the greater the demand as compared with the supply, the higher it is. And, indeed, there is question here, not only of the _mass_ of things supplied or demanded, but also of the _intensity_ of the supply and demand.(607)