Separating countable and uncountable nouns in a sentence

Solution 1:

I don't think that those changes are correct. You cannot have a list with 2, or more, conjunctions: ".... A, B, and C and D."

to start with:
"This operation has been a fundamental cause of the exacerbated wage disparity, excessive property investment, abnormally high leverage, and an asset bubble."

1. unless there are only two levels of wages (like $80,000 and $120,000), you must say "wage disparities".
2. simplify "abnormally high" to "inordinate". In this context, there is no practical difference.

For the list to sound most natural, all the items should be made plural. I don't think this changes the meaning at all.

"This operation has been a fundamental cause of exacerbated wage disparities, excessive property investments, inordinate leveraging, and asset bubbles."