Final answer:
Edy's distribution of cookies with her campaign message could lead to an improved chance of election success because of the social principle of reciprocity, where voters may feel obliged to repay her kindness with their vote.
Step-by-step explanation:
When Edy gives out cookies with the message "Vote for Edy" on them as part of her campaign for school President, one reason this approach might improve her chances in the election is due to the principle of reciprocity. Reciprocity is a social norm that suggests people feel compelled to return favors or kindness. In Edy's case, students may feel inclined to vote for her because they received a cookie from her, which can be considered a kind gesture.