Investment is an art, not science. The difference betweet art an science is joy. Art is developed by  enjoying it and science is developed by researching it. One who enjoy in investing will develop art of investment.   

My best insight is the one given on my signature and it is from Benjamin Graham :

To achieve satisfactory investment results is easier than most people realize ; to achieve superior results is harder than it looks .
Benjamin Graham
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Originally posted by subu76 The following reasons often cause PE rerating of a company 1. Increasing margins 2. Increasing dividends 3. Demonstration of consistency.

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very well said