So I was spitballing some ideas around this a while back, although I was more focused on income inequality at the time. I think the best idea I came up with was something like a progressive taxation system where a company's taxes were determined by the highest paid employee (including the value of benefits and things like stock grants) minus the lowest paid employee, divided by the company head count. If executives want to keep bringing in eye watering salaries they either need to pay all their employees significantly more, or hire a hell of a lot more of them at current rates. There's probably some flaws and things that could be tweaked there, but I think it's a start.