§ 4. #Practicability of the wage system#. This change has brought with it grave problems of social organization and social welfare, which it is not the place here to discuss. But whatever be the difficulties of the wage system it has certain practical merits of workableness which account for its progress and dominance.[2] The larger the market and the longer the waiting period in industry, the greater the element of uncertainty and financial risk. Under the wage contract the employer, as the one best prepared to do it, takes the risk as to the future selling price of the product; the worker gets in a definite sum at once the market value of his services. Wage payment, therefore, is a form of insurance to the workingman; he gets something definite instead of taking chances he is ill prepared to take. Wage payment is a form of credit to the laborer whose labor is applied to producing the goods for customers distant in time and in place. The employer advances to the workman the present value of the future sale, discounting it at the prevailing rate of interest. Wage payment implies a contract by which the employee on his part agrees to render service and the employer on his part agrees to pay for it. The methods of determining and measuring the amount of service of the employee are called "methods of industrial remuneration." The many varieties may be grouped in two classes: time payment and piece payment, corresponding with the two modes of measuring labor, time work and piece work. § 5. #Time work.# Time work came first and was long almost the only method. In time work the employee is paid by the hour, day, week, month, or year, as the case may be. This is very satisfactory for small enterprises, where the master works with his own hands alongside of the employee, overseeing him, teaching him, and stimulating him by his own presence and example of industry. This method prevails still in nearly all farming work, in many kinds of manufacturing, in most transportation, in clerical positions in trade, and in general where the employee must perform a variety of tasks.