Learn to value a stock · Day 19 of 28

Growth, and what is already priced in

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Key idea: A great company is not automatically a good investment. What matters is whether its growth is already in the price.

Everyone can see that some companies are growing fast. Because everyone can see it, that growth is usually reflected in the share price already.

Think of two companies. One grows profit 25% a year and trades at 60 times earnings. The other grows 5% a year and trades at 9 times. The fast grower has to keep delivering for many years just to justify its price; any slowdown can hit the shares hard. The slow grower only has to avoid shrinking.

The PEG ratio, P/E divided by the growth rate, is a rough way to compare them. A PEG near 1 means you pay about one turn of P/E per point of growth. It is crude: it ignores how long growth lasts and how certain it is.

The useful question is never "is this a great company?" It is "what does the price assume, and how likely is that?", which is the reverse DCF from Day 11.

Quick check

A stock has a P/E of 30 and earnings growth of 15% a year. What is its PEG ratio?

See what the market is pricing in →

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Educational content only, not investment advice. Examples use made-up or historical figures.

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