[pabianice]

When I was in graduate business school, we were teamed up to do a particularly tough case in business finance. I worked on the case for 10 days and then met with my "partner" to discuss what we had. He read my analysis. I then asked him for his, and he said, "I'm not going to give it to you. I think mine is better" and he walked out. He used both his and mine and got an "A;" I got a "B+" with just mine.

I thought about ratting him out to the prof, and then decided to live with it. I'm sure my "partner" has since found a very lucrative career somewhere in business.

[RightWhale]

I think mine is better

Happens all the time. Usually not so obvious like exchanging hostages. The sooner one learns this the better, and one can still be trusting while keeping things under one's hat until it is time.