I just found a discussion of this, which was interesting, because I was using same breakdown for stock evalaution purposes since the 70's.
Here is the most important Lesson Learned or insight I have gained in my years of Investing and Trading in the stock market.
The markets valuation of a stock is based on the following factors
70 % of the stock's price is based on the movement of the overall stock market.
20 % of the stock's price is based on the sector or industry the stock is in.
10 % of the stock's price is based on the actual quality of the stock itself.
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There are two 70/20/10 models in business: 1) education and 2) managing innovation.
 70/20/10 in Education
The 70/20/10 Model is also used as a Learning and Development model, according to the Princeton University Learning Process.
* 70% of learning & development takes place from real-life and on-the-job experiences, tasks, and problem solving. This is the most important aspect of any learning and development plan. For example, the real learning from a skill acquired in a training program, or from feedback, takes place back on the job when the skill or feedback is applied to a real situation.
* 20% comes from feedback and from observing and working with role models.
* 10% of learning and development comes from formal training.
 70/20/10 in Managing Innovation
The 70/20/10 Model is a business resource management model pioneered by Eric E. Schmidt and articulated about Google in 2005.
This model dictates that, to cultivate innovation, employees of a company should utilize their time in the following ratio:
* 70% of time should be dedicated to core business tasks.
* 20% of time should be dedicated to projects related to the core business.
* 10% of time should be dedicated to projects unrelated to the core business.