All of the following factors affect the level of wages except which of the
following?
o
a. the actions of labor unions.
b. minimum-wage laws.
o
c. the law of supply and demand.
o
d. the production possibilities frontier.

The production possibilities frontier is not the factor among the others that   affect the level of wages.

Explanation:

Production possibilities frontier can be defined as a graph or curve which shows the combinations of two goods that are produced when the resources of the economy are fully utilized. It is the opportunity cost of acquiring an additional unit of a commodity.

This factor is totally depend on the availability of sources and do not affect the wage rate or level of the employees. The other factors such as the he actions of labor unions, minimum wage law and the law of supply of demand has the direct link with the wage rate.

d is the best answer for this question.