Students who minor in economics must have a GPA of at least 2.000 in economics courses attempted and must receive at least a grade of C- in all classes counting toward the minor. Nonlecture classes (including ECO 4185 , ECO 4186 , ECO 4187 , ECO 4390 and ECO 4398 ) cannot be used toward an economics minor. All advanced economics courses must have the ECO prefix; no substitutions are allowed.