RT Journal Article SR Electronic T1 Positive Side Effects Of In-App Reward Advertising JF Journal of Advertising Research JO J Advert Res FD WARC SP 272 OP 282 DO 10.2501/JAR-2017-036 VO 57 IS 3 A1 Joowon Lee A1 Dong-Hee Shin YR 2017 UL http://www.journalofadvertisingresearch.com/content/57/3/272.abstract AB 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. By analyzing field data on user-level game-app usage behavior, the current researchers found that users who were offered a free game item as a reward more likely would purchase the game item. Existing users who already had purchased game items also made more subsequent purchases after experiencing the free game items than they had in previous game play without these incentives. The study identifies the moderating role of users' engagement level in the game on sampling effects.