Positive Side Effects of In-App Reward Advertising: Free Items Boost Sales—A Focus on Sampling Effects

Giving free game items to mobile users through in-app reward advertisements could generate a sampling effect and increase the probability of users making in-app purchases.
Lee and Shin


  • Direct experience with free game items increases users’ likelihood of purchasing game items.
  • The number of purchases and the purchase amount both increase after users experience the free game item.
  • Effectiveness of free-product sampling is higher for more engaged users.