facing

[wowenglish1]

I would like to know the subject of "face" in the next sentence.
Underemployment is a broad measure of the labor market opportunities facing workers.

[syku]

This is an interesting question.

"Underemployment is a broad measure of the labor market opportunities facing workers." can be rephrased to "Underemployment is a broad measure of the labor market opportunities faced by workers."

In the end, workers face underemployment, not the other way around.

[TheParser]

I would like to know the subject of "face" in the next sentence.
Underemployment is a broad measure of the labor market opportunities facing workers.

(NOT a teacher) Perhaps the subject of "face" is "the labor market opportunities." The complete sentence may be: Underemployment is a broad measure of the labor market opportunities (that are) facing workers. ("that" = relative pronoun that refers to "the labor market opportunities.")