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Whether Groupon is overvalued depends on its price to earnings ratio. What is its current P/E ratio?

I disagree. P/E is just one way of valuing a company.

Regardless of their current valuation, my personal opinion is that Groupon faces serious issues regarding the long term sustainability of their business model. They have dominated an ecosystem that will eventually balance itself. I am skeptical that they can maintain their current valuation through that process.

I agree that there are other methods you can use. I thought it would be a start to bring the level of the discussion up to specifics at all.

What is Greplin's current P/E ratio?

Clearly P/E on its own is not the complete story.

A company as far along as Groupon can be valued based on earnings.

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