You are aware that your neighbor trades stocks based on confidential information he overhears at his workplace. This information is not available to the general public. This neighbor continually brags to you about the profits he earns on these trades. Given this, you would tend to argue that the financial markets are at best form efficient.

Semi-strong Form Efficient.

Explanation:

There are three levels of market efficiency as weak, semi-strong and strong.

In a semi-strong form efficient market, the stock prices change independently of the previous return points and the current information so it is not possible to predict the future stock prices.

The example given in the question, which states that the neighbor has non-public information, can be classified as a semi-strong form efficient market.

I hope this answer helps.

A:)

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