Farnese Blue diamond fetches $6.7m at Geneva auction

A useful link relating to Elasticity of Supply http://www.bbc.co.uk/news/world-europe-44134010

And see below, where to find it in the spec:-

Edexcel spec reference 1.2.5 Elasticity of supply                                

AQA spec reference  Price elasticity of supply 

OCR spec reference P9 Explain, with the aid of a diagram, the different values of PES