Merricks v Mastercard: Will US-style class actions become the norm?

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In a landmark judgment (and in unusual circumstances), the UK Supreme Court has held that the ongoing Merricks v Mastercard case should be referred back to the Competition Appeal Tribunal. Not only is this a step towards Merricks’ claim that interchange fees were "an invisible tax on UK consumers" being heard in court, but – more importantly – it is also likely to have a significant impact on UK "collective proceedings" for years to come.