Acknowledgements This chapter adapted for OpenLearn is from ‘Microeconomics by Susan Himmelweit, Roberto Simonetti and Andrew Trigg, published by Thomson Learning in association with The Open University, 2001 and ‘Markets’ one of the three core books from the D319 course Understanding Economic Behaviour: Households, Firms and Markets. The content acknowledged below is Proprietary (see terms and conditions) and is used under licence. Grateful acknowledgement is made to the follow
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