Shanghai Guangdian Electric Group Co., Ltd. (SHSE:601616) shareholders won't be pleased to see that the share price has had a very rough month, dropping 28% and undoing the prior period's positive performance. The drop over the last 30 days has capped off a tough year for shareholders, with the share price down 27% in that time.

Although its price has dipped substantially, you could still be forgiven for thinking Shanghai Guangdian Electric Group is a stock not worth researching with a price-to-sales ratios (or "P/S") of 3x, considering almost half the companies in China's Electrical industry have P/S ratios below 2x. However, the P/S might be high for a reason and it requires further investigation to determine if it's justified.

What Does Shanghai Guangdian Electric Group's P/S Mean For Shareholders?

For example, consider that Shanghai Guangdian Electric Group's financial performance has been poor lately as its revenue has been in decline. One possibility is that the P/S is high because investors think the company will still do enough to outperform the broader industry in the near future. If not, then existing shareholders may be quite nervous about the viability of the share price.

Is There Enough Revenue Growth Forecasted For Shanghai Guangdian Electric Group?

In order to justify its P/S ratio, Shanghai Guangdian Electric Group would need to produce impressive growth in excess of the industry.

Retrospectively, the last year delivered a frustrating 30% decrease to the company's top line. As a result, revenue from three years ago have also fallen 32% overall. So unfortunately, we have to acknowledge that the company has not done a great job of growing revenue over that time.

Weighing that medium-term revenue trajectory against the broader industry's one-year forecast for expansion of 27% shows it's an unpleasant look.

With this in mind, we find it worrying that Shanghai Guangdian Electric Group's P/S exceeds that of its industry peers. It seems most investors are ignoring the recent poor growth rate and are hoping for a turnaround in the company's business prospects. Only the boldest would assume these prices are sustainable as a continuation of recent revenue trends is likely to weigh heavily on the share price eventually.

What We Can Learn From Shanghai Guangdian Electric Group's P/S?

There's still some elevation in Shanghai Guangdian Electric Group's P/S, even if the same can't be said for its share price recently. Using the price-to-sales ratio alone to determine if you should sell your stock isn't sensible, however it can be a practical guide to the company's future prospects.

Our examination of Shanghai Guangdian Electric Group revealed its shrinking revenue over the medium-term isn't resulting in a P/S as low as we expected, given the industry is set to grow. When we see revenue heading backwards and underperforming the industry forecasts, we feel the possibility of the share price declining is very real, bringing the P/S back into the realm of reasonability. If recent medium-term revenue trends continue, it will place shareholders' investments at significant risk and potential investors in danger of paying an excessive premium.

Plus, you should also learn about these 4 warning signs we've spotted with Shanghai Guangdian Electric Group (including 2 which are concerning).

It's important to make sure you look for a great company, not just the first idea you come across. So if growing profitability aligns with your idea of a great company, take a peek at this free list of interesting companies with strong recent earnings growth (and a low P/E).

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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.