External factors such as expiration of basic patents and industry competition effect

The correct answer is: A. patents premium

A patent premium is a premium that is paid for a stock that is protected by patents. Patents give a company the exclusive right to make, use, and sell an invention for a certain period of time. This can give a company a significant competitive advantage, and can lead to higher profits. As a result, investors are willing to pay a premium for stocks that are protected by patents.

The other options are incorrect because:

• A competition premium is a premium that is paid for a stock that is in a competitive industry. This is because companies in competitive industries are more likely to generate high profits.
• A company’s beta is a measure of its volatility relative to the market. A high beta stock is more volatile than the market, and a low beta stock is less volatile than the market.
• An expiry premium is a premium that is paid for a stock that is about to expire. This is because investors are willing to pay
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