Margory spends her workday making sure that purchase orders are completed properly. She's unhappy with her job but realizes that most jobs for which she is qualified are similar. Which concept does this illustrate?

iron cage

Explanation:

Based on the information provided within the question it can be said that this scenario illustrates the concept of an iron cage. In the context of sociology, this term refers to individuals being trapped in a system that is based on control and providing a specific an sole purpose. Which is what Margory situation illustrates since she is in a job that has a specific purpose and she is only qualified for similar jobs, thus trapped within the industry (system)