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Which of the following is true about labor productivity? It is the amount of total factor productivity (TFP) per unit of labor It is a more general and better measure of productivity than TFP It is more difficult to measure than TFP all of the above none of the above Economic activity that is above potential output signals that potential output is about to increase occurs near the trough, rather than the peak, of a business cycle Is not possible results from an economic shock to which the economy has yet to adjust fully none of the above Which of the following constitutes an Input to the Cobb-Douglas production function? total factor productivity capital labor all of the above none of the above