Robots (and other tools) are capital. A way I think of it:
if you formed a co-op of sorts, with let's say 20 people, starting with no land ownership and hardly any tools, they could try to make a business. Whatever they end up starting would be a fairly low-productivity business- washing windows, janitorial services, lawn service, etc. The more tools and land a co-op has to work with, the more productive they can be. With a few million dollars up-front they could have built a factory instead.
The increased productivity generated can be attributed to the capital share of income.
if you formed a co-op of sorts, with let's say 20 people, starting with no land ownership and hardly any tools, they could try to make a business. Whatever they end up starting would be a fairly low-productivity business- washing windows, janitorial services, lawn service, etc. The more tools and land a co-op has to work with, the more productive they can be. With a few million dollars up-front they could have built a factory instead.
The increased productivity generated can be attributed to the capital share of income.