When close to half the companies in China have price-to-earnings ratios (or "P/E's") above 25x, you may consider Cangzhou Mingzhu Plastic Co.,Ltd. (SZSE:002108) as an attractive investment with its 20.5x 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 limited.

For instance, Cangzhou Mingzhu PlasticLtd's receding earnings in recent times would have to be some food for thought. 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?

There's an inherent assumption that a company should underperform the market for P/E ratios like Cangzhou Mingzhu PlasticLtd's to be considered reasonable.

If we review the last year of earnings, dishearteningly the company's profits fell to the tune of 20%. This means it has also seen a slide in earnings over the longer-term as EPS is down 2.5% in total over the last three years. Accordingly, shareholders would have felt downbeat about the medium-term rates of earnings growth.

Weighing that medium-term earnings trajectory against the broader market's one-year forecast for expansion of 42% shows it's an unpleasant look.

With this information, we are not surprised that Cangzhou Mingzhu PlasticLtd is trading at a P/E lower than the market. However, we think shrinking earnings are unlikely to lead to a stable P/E over the longer term, which could set up shareholders for future disappointment. Even just maintaining these prices could be difficult to achieve as recent earnings trends are already weighing down the shares.

The Key Takeaway

While the price-to-earnings ratio shouldn't be the defining factor in whether you buy a stock or not, it's quite a capable barometer of earnings expectations.

We've established that Cangzhou Mingzhu PlasticLtd 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. Unless the recent medium-term conditions improve, they will continue to form a barrier for the share price around these levels.

Plus, you should also learn about this 1 warning sign we've spotted with Cangzhou Mingzhu PlasticLtd.

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.

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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.