The top 10% of households hold 67% of all wealth. If we assume that every worker produces roughly the same value, that implies ⅔ of value produced by the average worker is being taken.
Of course, 33% is not 15%, but I’d say it’s roughly in the ballpark. And in certain cases, there are definitely workers who are exploited to that level.





The only way to create wealth is via work, e.g., income. It’s not a perfect measure, I concede, since wealth is static and can accumulate over time. However, I think we can still use it as a rough estimation of stolen income over time.
However, this source claims there is a 70% gap between wages and produced value. That roughly matches the number I gave.