Three years after former Mediacom CEO Jon Mandel gave a blistering speech alleging widespread media rebates in the U.S. — and the Association of National Advertisers launched a crusade to investigate and stop them — nothing much has changed, according to a report by McKinsey & Co.

The McKinsey effort, which was scheduled to be discussed at the ANA’s Advertising Financial Management Conference on Monday, was led by Sarah Armstrong, a former Coca-Cola Co. executive who dealt with media rebates extensively during the last 15 of her 20 years there before moving to McKinsey last year.

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