This is different to OP's question. OP is specifically asking why it can't be so that the entrepreneurial hairdresser is guaranteed, in some moral sense at leas

This is different to OP's question. OP is specifically asking why it can't be so that the entrepreneurial hairdresser is guaranteed, in some moral sense at least, to get no more than once what they'd have earned as a non-entrepreneurial hairdresser.