An opt-in system for advertising leaflets has been introduced in several municipalities since 2018. Under this system, residents no longer receive unaddressed advertising mail unless they actively register for paper leaflets by placing a YES-YES sticker on their mailbox. Independent research agency Markteffect will investigate the impact of the YES-YES sticker on retailer reach and how consumers in these municipalities can best be reached.
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info@markteffect.nl 
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