Question

This question is a continuation of the "Contagious Speculation and a Cure for Cancer: A Nonevent that Made Stock Prices Soar" from your Practice at the end of the session. So read that first if you do not remember, and then continue. After the NYT publication on Sunday, May 3, 1998, the EntreMed stock price rose from $ 12.063 at the market close on May 1, 1998 to $85 at the market opening on May 4, 1998. According to one form of Market Efficiency, the stock price should not have reacted to the May 3, 1998 publication, because it did not contain any new information. What form of market efficiency does this stock rise violate? Market efficiency is not violated. Weak form. Semi-strong form. Strong form

Answer 1

They are 3 levels of Market efficiency:
1. Strong efficiency: Insider information, fundamental analysis and technical analysis are unless in such a market. It already reflects all the prices.

2. Semi- Strong: fundamental analysis and technical analysis are unless in such a market. It is quickly reactive to price chages.

3. Weak: technical analysis is unless in such a market. The price follows a random walk.

Answer: Strong form.