Explanation

The sentence states that market forces are bidding up the value of certain attributes of labor that are “more measurable than is the knowledge born of experience.” The blank has to do with trends in wages for those whose main value in the labor force lies in “experiential knowledge.” Since experiential knowledge appears to be losing value in the bidding war for labor, the blank needs to be filled in a way that leads to something negative. Given the “not” that precedes the blank, “favor” and “aid” make for such an outcome and result in sentences alike in meaning.

Thus, the correct answer is favor (Choice A) and aid (Choice B).
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Answers : A,B

Basically the market forces are bidding up the value of the attributes of the labor that are more measurable than the knowledge gained through experience.
As expected the trends in the wages will also follow the market forces and assign higher value to the other attributes, and so this will not help the persons whose main values lie in the experiential knowledge.
Somewhere close to help is aid and favor in my sense.