The market demand for labor represents 1.The vertical summation of individual firms’ demand for labor 2.The horizontal summation of individual firms’ demand for labor 3.The number of firms that already hire workers 4.The average firm’s demand for labor 5.None of the above

The market demand for labor represents 1.The vertical summation of individual firms’ demand for labor 2.The horizontal summation of individual firms’ demand for labor 3.The number of firms that already hire workers 4.The average firm’s demand for labor 5.None of the above