I suspect that the percentage of knowledge workers in Europe & the US/CA who have held menial jobs prior to entering the professional workforce is significantly higher than the percentages in developing countries. I could be way wrong, but it seems there's far less social stigma attached to holding service jobs in countries where everyone knows there are attainable, relatively straightforward to achieve, better options, compared to countries where the middle class is still much smaller and a large percentage of service workers know going in they'll be holding those types of jobs for life.