Question: In the 1990s, there was a surge of interest in sports memorabilia. In particular, baseball memorabilia shows witnessed lines of people willing to pay for a baseball player's autograph on a picture, baseball, or baseball card. All of this attention increased the interest of kids in buying baseball cards. A natural corollary of this is the trading of baseball cards. Assume you have a set of baseball cards for the current year but are missing some. In particular, you are a Cardinals fan and have all of the Cardinals cards except Albert Pujols. Would you trade for it? What would you want to give up for the Pujols card? What would the Pujols card holder expect in return? Who benefits from this trade?