The labor curve(s) will shift if there is an increase in productivity or an increase in the demand for the final product.

Demand, to the right.

Explanation:

Because productivity has increased, and (or) the demand for final products has increased as well, workers are both more desired because they are more productive, and more needed because more final products need to be made.

This will shift the labor demand curve to the right because demand for labor will rise.

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