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In a manufacturing​ plant, workers use a specialized machine to produce belts. A new machine is invented that is​ labor-saving. With the new​ machine, the firm can use fewer workers and still produce the same number of belts as it did using the old machine. In the long​ run, both labor and capital​ (the machine) are variable From what you​ know, what is the effect of this invention on the average product of labor ​(AP Subscript Upper L​).