The Effect of Physical Return Gifts on the Frequency and Amount of Charitable Donations: Evidence from Kickstarter | RISE Research

This study examines how physical return gifts (tangible rewards offered to campaign backers) affect donor participation and donation amounts in reward-based crowdfunding, using an original dataset of 2,034 Kickstarter social-impact campaigns comprising 17,222 reward tiers and 14,053 reward items. The paper sets two competing behavioral theories against each other: reciprocity/gift-exchange theory, which predicts tangible gifts increase giving by activating a felt obligation to reciprocate, and motivation crowding-out theory, which predicts gifts reframe altruistic acts as market transactions and reduce intrinsic motivation to give. Using campaign-level OLS regressions with fixed effects for social-impact theme, launch month, and country, the study finds physical return gifts are positively associated with total funds raised (+257.6%), number of backers (+89.6%), average donation per backer (+61.8%), and overall campaign success probability (+8.7 percentage points), directly contradicting a simple crowding-out prediction that gifts should lower average contribution size. However, reward-tier fixed-effects models reveal an important qualification: within the same campaign, physical reward tiers outperform non-physical ones, but this advantage follows an inverted-U pattern relative to reward price, rising as reward value increases, peaking at moderate price points, then declining sharply at high pledge thresholds, with the decline steeper for physical tiers. The paper concludes that neither reciprocity nor crowding-out theory is universally correct; both mechanisms operate simultaneously within the same campaigns, with reward pricing as the key moderating factor determining which dominates. Practically, the study advises fundraisers to offer physical rewards at accessible, mid-range price points to maximize donor engagement, while cautioning traditional non-profits against importing reward-based tactics without accounting for how donor expectations differ in explicitly altruistic charitable contexts.