Traders of the Caribbean

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CVS Caremark Corp. (CVS:US) plunged the most in the Standard & Poor’s 500 Index, sliding 20 percent to $28.87. The drugstore chain with more than 7,000 U.S. stores is the target of an investigation by the U.S. Federal Trade Commission, which is probing some business practices of the company, Chief Financial Officer David Rickard said in an e-mailed statement. Earlier the company said its unit for managing pharmacy benefits lost $3.7 billion in contracts in the third quarter and forecast narrower margins next year.