I’d like to thank my publishers Pearson Education and everyone involved in the production of this book. To be asked to write a new book in the Mastering series is a great honour and we have all worked really hard. Commodities are more important now than ever before, with the global population increasingly placing huge pressure on our scarce resources.
Heartfelt thanks go to my specialist contributors, all of whom have full time careers and yet still managed to find time to put pen to paper. These are: