We test a self-signaling theory using two large-scale, randomized controlled field experiments. Smartphone users are randomly sampled to receive promotional offers for movie tickets via SMS technology. Subjects are exposed to different pre-determined levels of price discounts and charitable...

Using detailed social broadcasting data from an online charitable giving campaign on Twitter, we evaluate two competing models of economic incentives on online pro-social behavior. Specifically, we focus on the effectiveness of gratitude-embedded messages on online charitable giving behavior,...