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I’m not sure what your question is @alta12… I mean, why not?
P/E ratio is one of the measures to determine if a company is worth investing in. The P/E ratio comes from the rationale of ‘well, let’s see how great this company is at generating money for its shareholders’.
If you use revenue, you’re not taking into account it’s COGS. If you use EBITDA, you’re not taking into account tax and depreciation effects. So net income seems like a fair measure (i.e. funds available either as dividends or reinvestment).
Hope that helps!