When an enterpriser is in possession of a secure monopoly which gives him large monopoly profits, he is often in a position to capitalize the monopoly profit and to sell out the business on such terms that he can receive an income as large as his monopoly income from the price which he receives for the business. Thus, in a community where safe investments bring regularly five per cent interest, suppose the case of a business in which there is an investment of a hundred thousand dollars in capital which gives a return of five thousand dollars in interest and fifteen thousand dollars in monopoly profits. If the monopoly is considered absolutely secure, it will not be hard to find purchasers who will be willing to give for the business four hundred thousand dollars; that is, they capitalize its ability to earn profits at three hundred thousand dollars and give one hundred thousand dollars for the capital which is already earning five thousand dollars a year. After the monopolist has sold his monopoly the purchasers do not consider the fifteen thousand dollars income per year as monopoly profits, but rather as interest upon their capital investment.