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Technological advances have been made so fast that a comparison of prices separated by only a few weeks must account for these advances if the comparison is to have any value . In 2000 , Amazon.com refunded customers who said they were charged differently for identical products depending on what Internet service provider or what Web browsers they used.Amazon denied using pricing based on demographics and says it has ended what it called " pricing tests . For the resource provider , larger number of processors with much more affordable price come with a higher administrative overhead . Cost-per-action ( CPA ) Pricing based on the number of actions in response to your ad . Summarising the 49 submissions , eleven respondents stated that they had no costing information ; five referred to the 2000 ILL / DD benchmarking study as a source of costing data and several suggested pricing based on internal costing exercises based on average staff time to process a request ranging from 14.5 minutes to 30 minutes . Eventually , people got sick of having their oil prices dictated by a monopoly , the government passed the Sherman Anti-Trust Act , and now every major business deal in this country requires government approval . As prices come under control , an inflation target can promote stability - - though if pushed too far inflation targets will result in an " overvalued " currency inviting a speculative attack .