The problem is that equality in the working class, internationally, means wages will become lower - because textile manufacturing in China is so cheap, for example. But it wouldn't mean equality across the board - i.e. the rich / higher management / 1% having to share their wealth with the bottom 99%. Another commenter mentioned 8 billion in less expenses for the US due to lower income tax, but those savings wouldn't end up at the working class, it'd be a benefit for companies and their higher management and shareholders.

Better financial results rarely / never mean higher income or conditions for employees.