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on 15 November 2009
Mr. Porter is an expert on competition. As a professional investor, I evaluate competitive strengths and weaknesses of companies on everyday basis. I cannot overemphasize how important Mr. Porter's writings are to my ability to pick investments that perform well. In my opinion, the first chapter is the most important one. Mr. Porter writes about five forces:

* Threat of new entrants
* Intensity of rivalry among existing competitors
* Pressure from substitute products
* Bargaining power of buyers
* Bargaining power of suppliers

These five forces can be a roadmap to determining the competitiveness of individual companies. Mr. Porter's books are long, but I highly recommend this book or any other book written by the author.

- Mariusz Skonieczny, author of Why Are We So Clueless about the Stock Market? Learn how to invest your money, how to pick stocks, and how to make money in the stock market
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on 5 November 2015
Great book for understanding your competitors highly recommend.
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