marginal effect　

marginal effect　边际效应　

The effect created by engaging in an incremental change in behavior.For example，consider a manufacturing business that is generating$10，000in profit.If that business produces 1extra unit and is then generating$10，010in profit，the marginal effect of producing that one extra unit is a$10increase in profits.Interpreting the marginal effect of certain actions requires isolating the action being considered and observing the change that occurs at the margin.