It does have more to do with education. Some one who has been educated in Aus, USA NZ, Canada or the more prominent EU countries, will have a degree by an internationally regognised instituation and there fore an employer can expect a better level of produtcion and before you comment on the fact that it would seem that the lower paid people are doing more work, my experiance has been they seem to be doing more work with out nesissarily getting more achieved, for example I will try to get my work done as quickly as possible through out the day which sometimes leaves me with times were i have nothing to do but cruise the internet what ever, but i have found that certain other nationalities in my exact postion will drag these tasks out over the course of the whole day just to make it look like they are working harder.