Historically, the answer has been that we as a society have freed up 3 Grugs for them to do something else. One can go to work in the factory that makes wheels

Historically, the answer has been that we as a society have freed up 3 Grugs for them to do something else. One can go to work in the factory that makes wheels. One can go to work in a factory that makes refrigerators, so that now half the harvest doesn't rot. One can go to work inventing semiconductors. These things make us far better off than having 4 Grugs carrying the harvest, or 3 Grugs idle. The problem now is that we're not sure what to have the other people do that will actually pay them a living wage. Or do we? The unemployment numbers are still pretty low. Is that just because people gave up and stopped looking for jobs? Is it because the immigrants left? Or is the economy actually doing fairly well at finding things for people to do?