Yup - it's the same basic idea as labor unions, but with participants taken from the group that controls 40% of the economy assets instead of those that have a near-minimum wage. That surely makes a difference in the amount of power that they can exert?
The basic idea of leveraging what you have a monopoly over is the same. But it is a good question you bring up of whether a group that controls 50% of economic assets in a particular industry is more powerful than a group that controls 50% of labor in the same industry.
A group where money is concentrated in a few hands, vs a group with thousands of members that controls a labor force that can be easily replaced by robots or outsourced? There is no color to that struggle, it's finished before it started.