2. _The issue of capital stock is the putting of the incomes of wealth into marketable form._ Stock companies, or corporations, are business enterprises which issue stock, or certificates of a share in their wealth and income. Doubtless the convenience of the sale and transfer of invested capital by the use of stock, has been one of several reasons for the large increase of this form of organization during the past century. Originally the stock of a company taken collectively represented all the capital invested, and each share entitled the owner to a given portion of the total income earned. The shares were issued in regular denominations in terms of money, and this amount expressed on the face of the stock remained fixed. But as a business proves more or less profitable, the value of a share of its income rises and falls regardless of the original amount of stock issued. At once there is a divergence between the nominal or face value and the market value of the stock. The nominal value is relatively permanent, the same year after year; it may increase by further issues, but rarely is it decreased. But when stock is the only form of claim on the earnings that is issued, the fluctuations of the market value of the stock record the real value of the business, that is, the capital value of the rents it is expected to yield. But in present practice there are several forms (of which stock is but one) in which an investor may buy a share in the earnings of a business. Bonds usually do not give their owner a vote in the management or make him in the technical legal sense a part owner in the business. Bonds representing money loaned to a company, and entitling their holder to regular interest payments, are nearest in form to the medieval rent-charge. Next stands preferred stock, which entitles the owners to share first in the dividends, if there are any; and finally the common stock, which gets a share only when the other claims are satisfied. By the multiplication and further variation of these readily salable claims on industrial incomes, the needs and desires of investors are met more fully and with greater precision. [Sidenote: Any continuing income can be capitalized]