[webnrrd2k]

Just to add a bit to the discussion - middle class wage earners generally pay a much higher over-all tax rate than the rich. The robot's labor would be almost certainly taxed like any other piece of equipment, with depreciation, etc... And the increased income would also be taxed at the same rate as the business. Both of these are, as far as I know, going to be much lower than the taxes that the original wage earner had paid.