Economists such as Tim Harford in the Undercover Economist have argued that this is a form of price discrimination: by providing a choice between a regular and premium product, consumers are being asked to reveal their degree of price sensitivity (or willingness to pay) for comparable products.
The Undercover Economist (ISBN 0-19-518977-9) (ISBN 0345494016) is a book by Tim Harford published in 2005 by Little, Brown.
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It explains in non-technical terms how Starbucks and other coffee providers price their products, why it is hard to buy a decent used car, why the health insurance system in the United States is failing, and why poor countries remain poor while the People's Republic of China has continuously grown rich in the last couple of decades.
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