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awen · 2019年10月31日

问一道题:NO.PZ2015111901000007

问题如下:

The topic of another lecture is prospect theory. Liu presents the students with the following two situations and asks them if they would accept or reject each one:

Situation 1 A 50% probability of winning $10,000 and a 50% probability of losing $4,000

Situation 2 A 50% probability of winning $10,000 and a 50% probability of losing $8,000

The students vote to accept Situation 1 but reject Situation 2. Liu then presents a third situation:

Situation 3 Choosing between losing $12,000 with 100% certainty, or accept­ing a gamble that offers a 50% probability of winning $6,000 and a 50% probability of losing $24,000

The students vote to accept the gamble in Situation 3.


Explain how the voting results in each of the three situations are consistent with prospect theory.

i.Accepting Situation 1

ii.Rejecting Situation 2

iii.Accepting the gamble in Situation 3

选项:

解释:

Prospect theory is an alternative to expected utility theory. This theory describes how individuals make choices in situations in which they must decide between alternatives that involve risk and how they evaluate potential losses and gains. Prospect theory considers how alternatives are perceived based on their framing, how gains and losses are evaluated, and how uncertain outcomes are weighted.


i. Accepting Situation 1

Most people reject a gamble with even chances to win and lose unlessthe possible win is at least twice the size of the possible loss.

In this gamble, the possible win is 2.5 times the possible loss, so the student vote to accept Situation 1 is consistent with prospect theory. Accepting Situation 1 is consistent with prospect theory because experimental evidence shows that most people reject a gamble with even chances to win and lose, unless the possible win is at least twice the size of the possible loss.


ii.Rejecting Situation 2

Most people reject a gamble with even chances to win and lose unlessthe possible win is at least twice the size of the possible loss.

In Situation 2, the chances to win and lose are the same but the possible win is only 1.25 times the possible loss. Thus the student vote to reject Situation 2 is consistent with prospect theory.

Rejecting Situation 2 is consistent with prospect theory because experimental evidence shows that most people reject a gamble with even chances to win and lose, unless the possible win is at least twice the size of the possible loss. In Situation 2, the possible win is only 1.25 times the possible loss, so the student vote to reject the investment is consistent with prospect theory.


iii.Accepting the gamble in Situation 3

People are risk-seeking when there is a low probability of gains or a highprobability of losses.

Deviations in decision making result in overweighting low-probability outcomes.

The gamble may appear more attractive than the sure loss, so the student vote to accept the gamble is consistent with prospect theory. Experimental evidence shows that risk-seeking preferences are held by a large majority of people when there is a low probability of gains or a high probability of losses. Therefore, the student vote to accept the gamble over the sure loss in Situation 3 is consistent with prospect theory.

为神马结果选择situation1,而不是situation2,

答案不能用cancellation 解释?因为在win的概率相同的情况下,可以只考虑输的概率cancellation ,此时找输的最少的即可。

1 个答案

企鹅_品职助教 · 2019年10月31日

这道题不是对比situation 1和2, 而是把两种情景分开来单独考虑每种情景是接受还是拒绝。

这道题是原版书课后题 Reading 7 第8题,李老师在原版书习题课中有讲解。同学先去听一下老师的讲解,有不懂的来追问。

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2021-01-05 17:32 1 · 回答

这道题1和2的对比是不是说明行为金融里面普通人的做法也是正确的??

2020-12-02 23:17 2 · 回答

Most people rejea gamble with even chances to win anlose unless the possible win is least twithe size of the possible loss.这个在课上没有讲吧,是新考纲删除了相关内容么?

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