Which government retail marketing campaign was the first to successfully use behavioral economics principles to increase citizen engagement by over 30%?

Test your knowledge about how government policies and campaigns have influenced retail strategies in the public sector. Understanding the intersection of politics and retail marketing can provide valuable insights into how governments connect with citizens as 'customers' of public services. This poll explores a notable government retail marketing initiative that transformed public engagement.

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The UK's 'Nudge Unit' tax compliance letters (2010)
The USA's 'Healthcare.gov' marketplace advertising (2013)
Australia's 'Go For 2&5' public health campaign (2005)
Canada's 'ParticipACTION' fitness promotion rebrand (2007)