Whoa, I thought someone was specifically talking to me with this thread.
In my opinion, having an economics background is great in the field of pharmacy. However, with it being just a BA, it's not going to open anymore doors for you vs someone who didn't have one. The PharmD is a very powerful degree in itself. If you want, you can do a joint degree PharmD/MBA at some schools, but I personally don't find it useful enough to go an extra year and the extra $. Everything I'm interested in (retail, hospital, compounding, ambulatory care, etc) will be available with just the PharmD.
It might help if you aim to be a district manager of a pharmacy chain or open up your own pharmacy someday. I remember my advisors always told me I could do some cost-analysis for pharmaceutical companies and this and that. But if that's all you really want, a regular MBA (or just a BA with years of finance experience) will do just fine.
Business degrees are tricky because they aren't really hands on. When you graduate with a BA in Economics (like I did), what do you REALLY know how to do? Graduates of MBA programs will not know how to run a business any better than a high school drop out who worked his way up a Safeway and now manages the district.
With that being said, go check out Pfizer's pharmacy careers in the FAQ section. It will go over all the areas a PharmD can work in. I'm sure there's a few business-minded careers over there.
And if applying to school, it makes no difference what degree you have. That's what the pre-req's and PCAT are for, so everyone takes the same core classes. However, if you are an engineering major with a 4.0 gpa, that will definitely turn some heads.