An American marketing agency has developed new technology called "observational research" which follows customers in shops through a hidden video camera, monitoring how they react to merchandise on sale.

Fame, a subsidiary of U.S advertising giant Omnicom Group, uses people's expression like raised eyebrows because of a high price, the length of time a person holds an item or if they struggle to open and sample a product to test whether the displayed item will sell well or should be altered in price or look.

Fame charges clients ...

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