It is important to understand the pedagogical reason behind this. In many educational contexts, answer keys are reserved for teachers to facilitate classroom discussion and marking. If answers were readily available in the back of the student edition, students might be tempted to copy solutions rather than struggle through the difficult process of application.
This protocol turns the answer key into a learning tool rather than a shortcut. Susan Grant herself, in teacher guidance notes, emphasizes that answers should be used for verification and reflection , not as a primary source of learning. Cambridge Igcse Economics Workbook Answers Susan Grant