In the 1970s and 1980s, labor unions commonly negotiated wage contracts that had which guaranteed that their wages would keep up with inflation

The correct answer is : Cost-of-living adjustments

Explanation:

They are a contractual provision that salary increases will keep up with inflation. It is normally equal to the percentage increase in the Consumer Price Index. It refers to a change in a person's monthly retirement benefit as well. It also helps to calculate how the wages go up as living expenses go up.

answer; obey the closest relative's wishes;