Growth investing is all about growth in earnings, because over time earnings and share price are closely linked.
To understand why this should be so, go back to the basic principles of compounding:
Example
Company B's growth rate was three times as fast as Company A's, but its accumulated capital after 15 years is over twelve times higher. No wonder the City likes growth.
Example

But the link between earnings and share price is not the same for all companies. Some earnings are valued higher by the market than others, and this is reflected in each company's Price Earnings (P/E) ratio:
Example
The two companies have identical earnings, but one is valued twice as highly as the other. Why?
The reason is that the share prices of companies reflect not so much reported earnings but projected earnings - in other words, what the market thinks a company is going to achieve in the coming one, two and three years. In the above example, the market clearly thinks that Company Y's earnings are going to grow much more quickly than Company X's.
That's fine but how does an investor inject some methodology into the valuation of earnings? The significance of the PEG ratio, popularised by Jim Slater, is that it relates the projected earnings of a company to its estimated growth rate, and comes up with a 'code' for deciding whether it is a good investment or a bad one.
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