What do do if you only have one area of interest, not three?

I have no interest in anything but Economics or, in a broader sense, business. But, a lot of my schools are asking me for three interests. At some of them, Economics is the only business-related major there. What do I do? Do I just put Economics again or do I put Undecided?

You would put undecided. Like you, I’m very interested in Econ or Business, but I put Math as my second major because it’s a big part of Econ.