That's like saying 'deadweight loss' "shouldn't be a term, because it's basic supply and demand".
There's a clear and identifiable trend or pattern resultant of the general model, there's no reason not to assign it a shorthand way of being referred to in discussion or study.
There's a clear and identifiable trend or pattern resultant of the general model, there's no reason not to assign it a shorthand way of being referred to in discussion or study.