Answer to Question #67939 in Economics of Enterprise for Jean
What does thinking at the margin mean?
Thinking at the margin means to think about your next step forward. The word "marginal" means "additional." The first glass of lemonade on a hot day quenches your thirst, but the next glass, maybe not so much. If you think at the margin, you are thinking about what the next or additional action means for you. Reference: http://www.econlib.org/library/Topics/College/margins.html