This week, in Behind the Winning Idea, we explore the strategy, execution and outcome of Tesco: Unforgettable Bag, winner of the Customer Experience Grand Prix in this year's WARC Awards for Effectiveness.

Applying behavioural economics thinking, Tesco greatly reduced the use of single-use plastic bags. In the 12 months after the campaign, bag reuse rates jumped from 5% to an amazing 60%. We spoke to Azliza Azmel, Corporate Services Director at Tesco Malaysia and Graham Drew, Chief Creative Officer at Grey Group to find out more.

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