When close to half the companies in China have price-to-earnings ratios (or "P/E's") above 27x, you may consider Shanghai Tongji Science&Technology Industrial Co.,Ltd (SHSE:600846) as a highly attractive investment with its 11x P/E ratio. Although, it's not wise to just take the P/E at face value as there may be an explanation why it's so limited.

As an illustration, earnings have deteriorated at Shanghai Tongji Science&Technology IndustrialLtd over the last year, which is not ideal at all. One possibility is that the P/E is low because investors think the company won't do enough to avoid underperforming the broader market in the near future. If you like the company, you'd be hoping this isn't the case so that you could potentially pick up some stock while it's out of favour.

What Are Growth Metrics Telling Us About The Low P/E?

The only time you'd be truly comfortable seeing a P/E as depressed as Shanghai Tongji Science&Technology IndustrialLtd's is when the company's growth is on track to lag the market decidedly.

If we review the last year of earnings, dishearteningly the company's profits fell to the tune of 12%. The last three years don't look nice either as the company has shrunk EPS by 29% in aggregate. Therefore, it's fair to say the earnings growth recently has been undesirable for the company.

In contrast to the company, the rest of the market is expected to grow by 38% over the next year, which really puts the company's recent medium-term earnings decline into perspective.

With this information, we are not surprised that Shanghai Tongji Science&Technology IndustrialLtd is trading at a P/E lower than the market. Nonetheless, there's no guarantee the P/E has reached a floor yet with earnings going in reverse. Even just maintaining these prices could be difficult to achieve as recent earnings trends are already weighing down the shares.

The Final Word

Using the price-to-earnings 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.

We've established that Shanghai Tongji Science&Technology IndustrialLtd maintains its low P/E on the weakness of its sliding earnings over the medium-term, as expected. At this stage investors feel the potential for an improvement in earnings isn't great enough to justify a higher P/E ratio. If recent medium-term earnings trends continue, it's hard to see the share price moving strongly in either direction in the near future under these circumstances.

Before you take the next step, you should know about the 3 warning signs for Shanghai Tongji Science&Technology IndustrialLtd (2 are a bit unpleasant!) that we have uncovered.

If P/E ratios interest you, you may wish to see this free collection of other companies with strong earnings growth and low P/E ratios.

Have feedback on this article? Concerned about the content? Get in touch with us directly. Alternatively, email editorial-team (at) simplywallst.com.
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.