>If you want to improve salaries, you can do that via unionization and lobbying for guaranteed raises. That's a popular leftist approach. You can also do that by advocating for bonuses based on personal achievement or corporate profit. The left has generally been disinterested in that, and has indirectly opposed it by advocating for higher taxes on bonuses.

The reason they are disinterested in bonuses based upon personal achievement is because it is guaranteed to be used as a tool for favoritism and divide and rule, which ultimately just lowers worker compensation.

It will only work if the measure is objective, which is almost always impossible.