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.

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