[icer2312]

Reminds me of the story about two sisters arguing over an orange.

"Management guru, Mary Parker Follett, tells the story of two highly competitive sisters quarrelling over a single orange that they both wanted. Neither of them would budge until their mother intervened and decided that the only way to resolve the dispute was to cut the orange straight down the middle and give each sister one half each. The first sister then squeezed her orange half to make a drink of fresh orange juice while the second sister grated her orange half for peel to add to orange scones. As a result, the sisters only got half of what they wanted." [0]

The sisters valued different parts of the orange. They'd both think they'd gotten the best deal (dating/marrying up) if they had shared it.

[0] http://www.managetrainlearn.com/page/win-win-deals