「商品代金を無料に!」にご用心、抽選キャンペーンの心理的罠とは – ダイヤモンド・オンライン
「商品代金を無料に!」にご用心、抽選キャンペーンの心理的罠とは ダイヤモンド・オンライン
QRコード決済の会社の「キャッシュバックキャンペーン」が目を引くが、「一律無料」よりも、はるかに大きな効果を持つキャンペーンの方法がある。
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