WARC carries out its own survey of media inflation twice a year. Working with a panel of four global media agencies, WARC asks each agency to estimate the annual percentage increase in cost per thousand based on an 'all adults' audience for specified formats, e.g. 30 second spot on TV, colour page in magazines.

The survey focuses on the following key markets: Australia, China, France, Germany, India, Italy, Japan, Russia, Spain, the UK and the US.

WARC then takes a straight average of the results.

To maintain confidentiality, WARC does not publish a list of those agencies that provide data.

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