The best recommendation letters are from faculty members who are familiar with your work outside of your test scores. You can ask a faculty member in any department to write you a letter, although you should have at least one from a member of the economics department. If you do not have 3 recommendations from economists, then a recommendation from a quantitative or analytical department (such as mathematics or statistics) is also helpful. Because so many lecture courses in the economics department are large, it is difficult to find a member of the economics department that will be familiar with you and your abilities. Thus, it is strongly recommended that you take your senior seminar no later than the fall of your senior year, or that you write a senior honors thesis. You should also seek out research opportunities that will give you the opportunity to work more closely with a faculty member.