Raj moves into Sheldon’s office and gets him back by moving in an extra-large desk. Sheldon refers to this as the opening move in a series of juvenile tit-for-tat exchanges. This is a great lead into to a discussion about the role of tit-for-tat in spurring long-run cooperation.
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Sheldon explains a new versions of Rock, Paper, Scissors to Raj: Rock, Paper, Scissors, Lizard, Spock.
Leonard bids on a movie prop and ends up winning. He pays the amount he bid so this is a first-price auction.
