When price declines, the value of marginal product of labor of all workers decreases.
Marginal product of labor is the change in output when labor employed in changed by one unit. For example, if total output of labor is 10 units when only one unit of labor is employed and 20 when two units of labour is employed. Price is $1. The marginal product of labor is $10 $1(20 - 10).
An increase in the price of output increases the marginal product of labor and a decline in the price of output decreases the marginal product of labor.
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