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The P/E ratio is only good for comparison within an industry, e.g. Nvidia vs AMD, but not NVIDIA vs Mercedes Benz.

The P/E ratio on its own says very little.
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@GAE not even then. You are completely leaving out the growth rate. A P/E ratio of 10, even in the same BRanche, must be valued completely differently if one company has an expected growth per share of 20% and the other in comparison of 5%.