What is one counter-argument to the premise that the wealth gap is a serious problem which needs to be addressed?

One such argument would be that Investments by the upper class create lower-class jobs.
Although wealth gap is indeed a serious problem and needs to be dealt with, there are certain counter arguments which prove the opposite. This is one of them, given that upper classes invest a lot of money in the country so lower classes can work as well.

Low risk and moderate growth.