Who said Economics has nothing to do with real life? This article from the New York Times gives an economically rational view of that little thing we call Love.
I will disagree with the part about your ROI equaling your investment. Love, unlike a business partnership, is not and should not be a 50/50 deal. There should never be a sense that someone is not doing their fair share, at least not in a readily measurable sense. These things suit different people in different ways. The challenge is finding someone to match your way.
