http://en.wikipedia.org/wiki/File:First_second_third_worlds_...
http://en.wikipedia.org/wiki/File:First_second_third_worlds_...
Note the amusing parallel between assuming the US is turning into a "third world" country, since the gaps in industrialization worldwide are closing, and the article's original assumption that an educated middle-class girl would never have to do the same work as a Spanish-speaking working-class woman.
Maybe you read a different article, but she was doing the same job as a Spanish-speaking working-class woman. The assumption is that it was just a stepping-stone to bigger and better things, while the 'Spanish-speaking working-class woman' works the job to make ends meet. She may have had some assumptions that as a middle-class girl she wouldn't end up working a waitress job to make ends meet, but there is a large portion of the population that gets sold the promise of "go to school, get educated, get a better job." This isn't just about 4-year degrees from a major university. It's the same with trade-schools, community colleges, 2-year degree programs, online universities, etc. The idea that a 'better job' will necessarily just follow from 'getting an education' is sold all over the place.