_The Different Functions of the Same Man distinguished in Business._--This distinction between the different functions that one person may perform is not a mere refinement of theory, but is something that is recognized in business and has great practical importance. In a corporation officials who are also stockholders receive salaries that are usually reckoned on the basis of the amount that they could get in the market if they were to enter the employment of other corporations and do the same kind of work they are now doing. Favoritism may give them considerably more than this amount, but even then this amount is the basis of the calculation which fixes their stipend. If they are paid more than their work is worth to their own corporations, what they get is something besides wages or any other normal and legitimate income. If they accept for their time less than they are worth, they make a donation to the corporation. Neither filching something for nothing out of the returns of the corporation, nor giving it a gratuity, is to be here assumed as existent, since we are not dealing with the phenomena of quasi-plunder or eccentric benevolence. The character of wages of management, as the reward for a high grade of labor, is recognized in business life, and the salary of the manager, whether he is a stockholder or not, is usually expressed in a definite sum of money and is gauged, crudely or accurately, according to his value as a servant of the company. _Dividends often Composite._--In like manner it is important in the bookkeeping of a company to ascertain how much of the return to the stockholders is merely interest on the capital they have themselves invested and how much is true profit, or the net gain which is over and above interest. In business life a distinction is pretty clearly maintained between the three kinds of income that have been described; namely, the reward of labor in all its forms, the reward of capital, going to whoever furnishes it, and the reward of a cooerdinating function, or the function of hiring both labor and capital and getting whatever their joint product is worth above the cost of the elements which enter into it. This essentially commercial margin of returns from production above all costs of production is profits in the strict sense and would be nonexistent in an absolutely static industry. It comes into existence in consequence of the changes with which social Economic Dynamics deals. _Three Incomes entirely Distinct._--Wages, interest, and profits, then, are the three incomes that we shall distinguish. We shall keep profits completely separated from the wages of any kind of labor and from the interest on any kind of capital. This income falls to the _entrepreneur_, otherwise called the undertaker, or the employer and cooerdinator of labor and capital, and it comes only when the product of the operations carried on in his establishment exceeds all wages and all interest that he has to pay.