Despite an already strong run, Groupon, Inc. (NASDAQ:GRPN) shares have been powering on, with a gain of 30% in the last thirty days. The last month tops off a massive increase of 195% in the last year.

In spite of the firm bounce in price, there still wouldn't be many who think Groupon's price-to-sales (or "P/S") ratio of 1.4x is worth a mention when the median P/S in the United States' Multiline Retail industry is similar at about 1x. However, investors might be overlooking a clear opportunity or potential setback if there is no rational basis for the P/S.

How Groupon Has Been Performing

Groupon hasn't been tracking well recently as its declining revenue compares poorly to other companies, which have seen some growth in their revenues on average. One possibility is that the P/S ratio is moderate because investors think this poor revenue performance will turn around. If not, then existing shareholders may be a little nervous about the viability of the share price.

Is There Some Revenue Growth Forecasted For Groupon?

Groupon's P/S ratio would be typical for a company that's only expected to deliver moderate growth, and importantly, perform in line with the industry.

Retrospectively, the last year delivered a frustrating 22% decrease to the company's top line. This means it has also seen a slide in revenue over the longer-term as revenue is down 69% in total over the last three years. Therefore, it's fair to say the revenue growth recently has been undesirable for the company.

Shifting to the future, estimates from the three analysts covering the company suggest revenue should grow by 6.2% per annum over the next three years. With the industry predicted to deliver 13% growth each year, the company is positioned for a weaker revenue result.

In light of this, it's curious that Groupon's P/S sits in line with the majority of other companies. Apparently many investors in the company are less bearish than analysts indicate and aren't willing to let go of their stock right now. These shareholders may be setting themselves up for future disappointment if the P/S falls to levels more in line with the growth outlook.

The Bottom Line On Groupon's P/S

Groupon appears to be back in favour with a solid price jump bringing its P/S back in line with other companies in the industry Generally, our preference is to limit the use of the price-to-sales ratio to establishing what the market thinks about the overall health of a company.

Given that Groupon's revenue growth projections are relatively subdued in comparison to the wider industry, it comes as a surprise to see it trading at its current P/S ratio. When we see companies with a relatively weaker revenue outlook compared to the industry, we suspect the share price is at risk of declining, sending the moderate P/S lower. This places shareholders' investments at risk and potential investors in danger of paying an unnecessary premium.

You always need to take note of risks, for example - Groupon has 2 warning signs we think you should be aware of.

If strong companies turning a profit tickle your fancy, then you'll want to check out this free list of interesting companies that trade on a low P/E (but have proven they can grow earnings).

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.