Since 2018, a number of municipalities have introduced an opt-in system for advertising leaflets. This means that residents no longer receive unaddressed advertising material unless they actively sign up for paper leaflets by placing a JA-JA sticker on their letterbox. Independent research agency Markteffect investigate the impact of the YES-YES sticker on retailers' reach and how consumers in these municipalities can best be reached.
info@markteffect.nl 
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