The Delta Global Shipping Index includes companies that derive at least 80% of their revenues from the seaborne transport of goods or the operating and/or leasing of ships. Additionally, constituents must have market capitalizations of at least $250 million and a 30-day average daily trading volume of at least $2 million. http://www.claymore.com/common/DisplayLiterature.aspx?ID=d3051c24-77a1-4d54-9d8d-3e83b85f44ae
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