No matter which IB Economics exam paper you’re answering, accurately using definitions is key to get good marks. When you show the examiner that you know what the question is about, you’ve already laid down the basis of a great answer. If you use vague definitions or don’t even include them, then you send the message that you’re not really sure what you’re writing about.
One of our students has prepared a great tool that you can use to check whether or not you know economics definitions. He has worked from this book.