The following rebus regards something commonly done, in certain places; it's debatable as to whether or not this is a fair practice.
Grading on a bell curve
It may not be fair because
It doesn't matter how well you do in the course, only how well you do compared to the other students in your class. If you're in a class with a bunch of underachievers, it would be easy to get a top score and thus a passing grade. Meanwhile, your friend might have class amongst the smarties and do just as well as you, but receive a lower grade.
systematization = making a system/order and tintinnabulation = chime/ring. There is a line separating them like a fraction with order over ring...over ordering.
Something commonly done, in certain places; it's debatable as to whether or not this is a fair practice.
People often take other out to dinner and offer to pay for their tab. It is polite to not order too much as it will become expensive. However, some people will take advantage of the free meal and overorder. It's debatable if it's fair because the person did offer to pay in the first place.