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2. (15 pts) There are three ninjas A, B, C that are competing for two bells. In this problem, we assume the ninjas report their

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2. (15 pts) There are three ninjas A, B, C that are competing for two bells. In this problem, we assume the ninjas report their valuation truthfully. Each ninja can receive at most one hell and every ball is given to some ninja. Not only do they have a valuation if they receive a hell, but they care if another ninja receives a bell. Ninja who receives a bell Ninja A Ninja B Ninja C ' Ninja A valuation 7 4 Ninja B valuation Ninja C valuation Each ninja's valuation of an outcome is the sum of her valuation of ninjas receiving a bell. For example, Ninja A values the bell at 7 if she receives it and she values the bell at 2 if Ninja C receives the bell. In this sense, if the outcome is that Ninja A and Ninja C win the bell, Ninja A values this outcome at 7 + 2 = 9. Recall that for a VCG mechanism, the social welfare of an outcome w E Q is defined by 211:1 WW)- (8) (b) (5 pts) Let :1: = (i. What is the welfare maximizing allocation hf\"? (5 pts) Let :1: = 6 again. Payment can be calculated using the following externality payment formula: p V Inax 11' HI) 'U' lid 4) :wESEZ( 3 Z 3( What is the price for each Ninja for the allocation in part (a). (5 pts) Now Ninja B changes her report 3:. Prove or disprove that the payment of Ninja B according to VCG mechanism is an increasing function of :r. If there is multiple in\" that maximizes the social welfare, we randomly choose one of those as our outcome

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