Such restrictions hinder the process of fair price discovery in the markets and thus represent deviation from the fair value of the stock. Then there may be some restrictions on the price movement itself (such as price bands and circuit filters which prevent prices of stocks moving more than a certain percentage during the day) that may prevent or delay the efficient price discovery mechanism.
Also, many institutional investors and strategic investors hold stocks despite deviation from the fair value due to lack of trading interest in the stock in the short term and that may cause some inefficiencies in the price discovery mechanism of the market. You can read more about efficient market hypothesis here which will further amplify on the subject.
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