Here is a Cultural Literacy worksheet on the concept of a cartel. This is a half-page worksheet with a reading of two sentences and three comprehension questions. The reading does mention Organization of Petroleum Exporting Countries (OPEC), which I think students should know about and understand.
If you find typos in this document, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.