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 Monopolistic competition: HHI generally taken to be between 101 and 999

Perfect Competition less than 100

有一题是关于behavioral finance的,大致的意思就是investor is not willing to sell loss when it goes down 这种bias在哪里得到阐述

prospect theory
confirmation bias ?
overconfidence bias ?

是否应该选over confidence bias, 而不是总的原理?

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HHI again:

An economically and mathematically perfectly competitive market will have an HHI of near 0 (in theory only, as a nearly perfect competitive market with 100 firms with 1% will still have a score of 100). A maximum HHI score (indicating a monopoly) occurs at 10,000.

The CFA text book proposes the following HHI metrics for the various competition levels:
  • Perfect Competition less than 100
  • Monopolistic Competition 101 to 999
  • Oligopoly 1,000+
  • Monopoly 10,000
Also I checked wiki, 500 is mono competition.

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QUOTE:
以下是引用yidiyuehan在2009-6-8 12:43:00的发言:


哈哈哈, 我最后就是这样想的,所以改了,因为觉得虽然没有交费用但是也是属于顾客,没有显形的费用但是隐性的费用应该还是有的,像回家老爸可能做顿好吃的什么的,哈哈~~~~

Only for fee -paid non directly beneficiary family client can treat as client. 

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QUOTE:
以下是引用peggyljp在2009-6-8 11:32:00的发言:

1. 我选的A,好像是consumers prefer variety

2. 选B吧,market portfolio包括stocks,bonds各种investments

3. 较低

4. 这题我也不大确定,了C

4. I also made a wrong,  correct is call market

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