ROI = return on investment
That's not a term that you'll learn in medical school. And if you're like many medical school graduates who majored in biology, chemistry, or another type of science, then you may have never seen the term "ROI" used (hard to imagine, isn't it?).
So, for those who are contemplating an MBA degree, the big question is: "what type of ROI do you expect to see from an MBA?"
I think the answer really depends on what you plan to do with an MBA. If you're going to start your own company, then an MBA that focuses on entrepreneurship could yield an immeasurable ROI. On the other hand, if you're pursuing an MBA just so that you can "break into" the non-clinical world, then it may be much more difficult to evaluate what type of ROI you'll see. An MBA is not inexpensive - it's quite an investment when you look at all the time and money you'll be spending.