Investopedia explains 'Market Letter'
The investment advice provided in market newsletters is not necessarily sound. Some financial service providers rate various market letters by evaluating how well investors would fare if they followed the advice of those letters. They have found that most letters underperform the market.
Not all market letters strictly provide investment advice. For example, some advertise automobiles and provide other information to Ferrari enthusiasts, while others focuses on biotechnology and pharmaceuticals.
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