Liu, W., &Aaker, J. (2008). The happiness of giving: The time-ask effect. Journal of consumer research, 35(3), 543-557.
This research examines how a focus on time versus money can lead to two distinct mind-sets that affect consumers' willingness to donate to charitable causes. The results of three experiments, conducted both in the lab and in the field, reveal that asking individuals to think about “how much time they would like to donate” (vs. “how much money they would like to donate”) to a ...