Williamson's work has important implications for the design of pay systems. It suggests that despite its advantages of clarity and apparent fairness, market contracting is not suited to all types of economic exchange. Employment relationships dominate the labor market today because work has become more complex, more dependent on particular individuals, and must be conducted under conditions of future uncertainty. If such conditions are not present, Williamson suggests that it is more efficient to use marketplace contracting for services rather than employment.