Week 6 - Conflict Flashcards

1
Q

What is Hotellings location model?

A

2 sellers along a strip of land. Each seller can choose their location on the strip, from 0 to 100. There is 1 customer at each location and each customer will buy from the seller closest to them

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2
Q

If seller 1 chooses location x and seller 2 chooses location y, what are the profits of the sellers in the Hotelling location model.

A

𝜋_1=(𝑥+𝑦)/2
𝜋_2=100−(𝑥+𝑦)/2

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3
Q

What is the nash equilibrium in Hotellings location model?

A

Both sellers are located in the middle and sell to half of the customers

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4
Q

What do the BRF look like in hotellings location model?

A

Both lines either side of the 45 degree line, crossing over at the midpoint

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5
Q

What does hotellings location model explain?

A
  1. Similar firms setting up in the same location
  2. product differentiation - restaurants and clothing brands targetting the buyer with median taste
    3.
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6
Q

True or false: with more than 2 players in the hotelling location model there is no nash equilibrium?

A

True

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7
Q

What is the rent-seeking game?

A

n players are competing for a prize worth V by making costly investments x1, x2…

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8
Q

In the rent seeking game what is the probability of winning the prize?

A

xi/sum of xj

basically your share of investments compared to everyones

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9
Q

In the rent seeking game what are the expected payoffs i.e. profit function?

A

𝜋_𝑖 = (xi/sum of xj)V - xi

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10
Q

What kind of things does the rent seeking game represent?

A

R&D investments
Teams competing for a prize putting in lots of effort/money
Candidates investing in political campaigns

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11
Q

When calculating the BR in the rent-seeking game, what do you have to remember to do?

A

Express the sum of all investments as your investments + everyone elses

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12
Q

After you have the BR in the rent-seeking game, what assumption do you have to make to get the nash equilibria?

A

Assume in equilibrium, everyone chooses the same investment, so replace, so replace sum of all firms investment with n*x

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13
Q

What is the travellers dilemma

A

Your bag was lost on a flight. The airline wants to reimburse you and asks for the value of the bags. They know you have incentive to inflate the value

You and your friend have to make independent claims about the value of your bag. If you both make the same claims, you will both get that money back. If claims are different, the airline will reimburse the lower amount. The person who made the higher claim will pay a penalty which will go to the other person.

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14
Q

What are the best responses in the travellers dilemma?

A

c1 = c2-1 if c2>real value
c1=c2 if c2 = real value

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