Here is a wonder article from the BBC which helps teaching the Law of Supply to your AS Economists or indeed your IB sets. There is also a video clip here which shows how wet weather can also affect crops of potatoes.
You could tweak this Q&A article for a homework and use graph to help demonstrate why the volitity of the price of wheat effects us all. A great table at the bottom of this article shows the concept of over or under production and it's consequences.
This resource comprises two practice exam papers (with supporting mark schemes) for each of the two Year 1 (AS) papers. The format of each practice exam paper follows precisely the format of the specimen assessment materials issued by the board that have been accredited by Ofqual.
This resource comprises a complete collection of editable PowerPoint presentations that are ideal for teaching individual topics for the whole Year 1 (AS) teaching content. Each presentation has a consistent, clear and professional format and maps precisely to the OCR specification teaching content.