There is the idea of the zero marginal product worker. Basically the thesis is that due to advances in technology, some large number of people are no longer useful as workers in any way, or at any rate their contributions would be small enough that they couldn’t earn minimum wage. It’s not clear that this is true - we’ve certainly had armies of unemployed people in the past just due to financial catastrophes. But it’s possible. Certainly there are a lot of jobs out there that require moderately specialized skills.
