In every university that I know, doctorate (and very commonly master’s) students are expected to do a number of things which I would categorize as work, related to the operation of the faculty, such as:
- correcting exams
- supervising exams
- supervising undergraduates in lab exercises, answering questions, usually organizing groups and lab exams
- teaching lectures on the methodology for exercises of a course
- various errands for the professor (I won’t get into detail in this, as it’s clearly immoral in my opinion)
From what I have heard, those practices are common in Greece. Every PhD student that I know has no official salary from the university, and may get paid from certain research funds for particular projects that he has to complete/contribute to from outside sources. According to the regulations in Greek universities, Master’s and above students are obliged to provide “auxiliary work” without this being specified further.
Given the fact that correcting exams is actual work, isn’t it immoral to do it without monetary compensation?