A financial instrument that is undervalued is said to be ``trading cheap ' and is a candidate for purchase . If a financial instrument is overvalued , it is said to be ``trading rich ' In this case , an investor should sell the financial instrument if he or she already owns it . Or , if the financial instrument is not owned , it is possible for the investor to sell it anyway . Selling a financial instrument that is not owned is a common practice in some...











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