I don't think either are particularly caused by the other. I'd argue both are naturally and ultimately caused by inherent subjectivity and bias in the populace.

"What's house X worth?" - Some people might be more willing to trade more money for it than others, and hence inequality ensues. Someone might become a millionaire simply from being in the right place at the right time, and/or buying/selling at the right time.

Or, "What's fair compensation for job X?" - Again different people may value job X differently. Hell, the worst high school teacher I've ever had turned out to be the most highly paid (over $160k a year - 20 years ago). Either it was simply out of generosity, or someone held him in high esteem. If the latter, it definitely wasn't me.

Likewise in education:

"Not everyone can go to university X - who gets to go and who doesn't?" - While a criteria may be used and itself may be objective, which criteria to use it ultimately subject to opinion. In ways, this is sort of similar to Goodhart's law.

"What's a degree from university X worth?" - Again opinion is a factor.

etc. etc...