Forehead-Slapping Stock Blunders (5 of 7) Forehead-Slapping Stock Blunders (7 of 7)

Forehead-Slapping Stock Blunders (6 of 7)

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Missing Sector Trends: Some stocks do buck the larger trend; however, this behavior usually occurs because there is some huge catalyst that propels the stock either higher or lower. For the most part, companies trade in relative parity to their peers. This keeps their stock price movements within a trading band or range. Keep this in mind as you consider your entry/exit points in a stock. Also, if you own stock in a semiconductor company (for example), understand that if other semiconductor companies are experiencing certain problems, your company will too. The same is true if the situation was reversed, and positive news hit the industry.
Source: http://www.investopedia.com/articles/basics/08/blunders.asp
Tags: warnings, trends