- This article concerns a concept of economic theory. For discussion of the term “margin” as used in the jargon of bourses, see “Margin (finance)”.
In
economics, a
margin is a set of
constraints conceptualised as a
border. A
marginal change is the change associated with a relaxation or tightening of constraints — either change
of the constraints, or a change
in response to this change of the constraints.