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University of Toronto *

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316

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Economics

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Apr 3, 2024

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University of Toronto ECO316: Applied Game Theory Instructor: Stanton Hudja Problem Set 3 Problem 1 Consider a variant of Hotelling’s model with two parties in which the voters’ preferences are asymmetric. Specifically, suppose that each voter cares twice as much about policy dif- ferences to the left of her favorite position than about policy differences to the right of her favorite position. For example, suppose that the position of party 1 is 0.2 and the position of party 2 is 0.5 . Then a citizen whose favorite position is 0.35 prefers party 2 to party 1, and a citizen whose favorite position is 0.3 is exactly indifferent between the two parties (because the distance between her favorite position and the position of party 1 is exactly half of the distance between her favorite position and the position of party 2). How does the Nash equilibrium differ from the Nash equilibrium of Hotelling’s model? 1 In a standard Hotelling model, the Nash equilibrium is where both parties choose to be at the median to capture the largest portion of the symmetric distribution of voters. However, when the voters’ preferences are asymmetric, which means the distribution of the voters are not symmetric anymore, the parties might not targeting the median because it cannot guarantee to capture the maximum votes as possible. In this case, a party might move slightly to the position where there are more voters. For example, to the left of the median if more voters prefer that position. Also, the Nash equilibrium will not be at the median, it will depends on how the preferences of the voters are distributated.
Problem 2 In class I discussed the variant of Hotelling’s model in which the two parties care only about the position of the winner (and not at all about winning). I considered the case in which party 1’s favorite position is to the left of the median, ࠵? , of the citizens’ favorite positions and party 2’s favorite position is to the right of ࠵? . I claimed that in this case, the only Nash equilibrium is the action pair in which both parties choose ࠵? . Why is the action pair in which party 1 chooses ࠵? and party 2 chooses her favorite position not a Nash equilibrium? Problem 3 Consider the citizen-candidate model. Assume ࠵? < ࠵? . Does the game have a Nash equilib- rium in which exactly one candidate enters and does so at a position different from ࠵? ? Problem 4 Does the citizen-candidate model have a Nash equilibrium in which there are two candi- dates, both of whose favorite positions are ࠵? ? Problem 5 An interesting possibility in the citizen-candidate model is that there is a Nash equilibrium in which a candidate loses. To make the argument simple, consider a very special distri- bution of preferences that is very different from the ones considered in class. The range of possible positions is from 0 to 1. Forty percent of citizens have favorite position 0, 5% have favorite position 0.25, 15% have favorite position 0.6, and 40% have favorite position 1. Figure 1: The Distribution of the Citizens’ Favorite Positions in Problem 6. See Figure 1. The Positions of the three candidates are indicated in red color. No citizen has a favorite position different from 0, 0.25, 0.6, and 1. Suppose that three citizens enter as 2 payoff of whining as the only candidate is negative No
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