In early July, Damon Rutton purchased a $90 ticket to the December 12 game of the Sarasota Shippers. Parking for the game was expected to cost approximately $26, and Rutton would probably spend another $12 for a souvenir program and food. It is now December 11. The Shippers were having a miserable season and the temperature was expected to peak at 5 degrees on game day. Damon is thinking about skipping the game and taking his wife to the movies and dinner, at a cost of $60. The amount of sunk cost that should influence Damons decision to spend some time with his wife is: