Final answer:
The technique of saying "even a penny will help" increases contributions to charity because of the relative contrast between a small and large request.
Step-by-step explanation:
The technique of saying "even a penny will help" increases contributions to charity because of the relative contrast between a small and large request. The foot-in-the-door technique is a persuasive strategy in which a person is asked to agree to a small favor or purchase a small item before being asked to agree to a larger favor or purchase a bigger item. This technique takes advantage of the principle of consistency, as our past behavior often directs our future behavior.