[cousin_it]

Sure, there will always be work for Bob to do. Clean the streets, fight crime, cure cancer, write bestselling novels. But there won't always be someone willing to pay Bob for that work, because there might be more effective options that don't involve hiring Bob. If you think Bob will always have a job due to some law of economics, I'd like to see that law spelled out. (Comparative advantage doesn't fit the bill, because it relies on the unrealistic assumption that capital is immobile.)