Which principle(s)best explains why adding "even a penny will help" will increase the success of fundraising requests?

Question

Quizplus · Accepted Answer

Commitment and consistency principle states that people are more likely to follow through on a commitment they have already made, even if it is a small one. In this case, adding "even a penny will help" to a fundraising request creates a small commitment for the potential donor, which makes them more likely to donate.

Which Principle(s)best Explains Why Adding "Even a Penny Will Help