It's not a stretch to say that Academy of Environmental Planning and Design, Co.,Ltd. Nanjing University's (SZSE:300864) price-to-earnings (or "P/E") ratio of 26.5x right now seems quite "middle-of-the-road" compared to the market in China, where the median P/E ratio is around 28x. While this might not raise any eyebrows, if the P/E ratio is not justified investors could be missing out on a potential opportunity or ignoring looming disappointment.

For example, consider that Academy of Environmental Planning and DesignLtd. Nanjing University's financial performance has been poor lately as it's earnings have been in decline. It might be that many expect the company to put the disappointing earnings performance behind them over the coming period, which has kept the P/E from falling. If not, then existing shareholders may be a little nervous about the viability of the share price.

View our latest analysis for Academy of Environmental Planning and DesignLtd. Nanjing University

Does Growth Match The P/E?

There's an inherent assumption that a company should be matching the market for P/E ratios like Academy of Environmental Planning and DesignLtd. Nanjing University's to be considered reasonable.

Retrospectively, the last year delivered a frustrating 34% decrease to the company's bottom line. However, a few very strong years before that means that it was still able to grow EPS by an impressive 34% in total over the last three years. So we can start by confirming that the company has generally done a very good job of growing earnings over that time, even though it had some hiccups along the way.

This is in contrast to the rest of the market, which is expected to grow by 37% over the next year, materially higher than the company's recent medium-term annualised growth rates.

With this information, we find it interesting that Academy of Environmental Planning and DesignLtd. Nanjing University is trading at a fairly similar P/E to the market. It seems most investors are ignoring the fairly limited recent growth rates and are willing to pay up for exposure to the stock. They may be setting themselves up for future disappointment if the P/E falls to levels more in line with recent growth rates.

The Key Takeaway

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.

Our examination of Academy of Environmental Planning and DesignLtd. Nanjing University revealed its three-year earnings trends aren't impacting its P/E as much as we would have predicted, given they look worse than current market expectations. When we see weak earnings with slower than market growth, we suspect the share price is at risk of declining, sending the moderate P/E lower. Unless the recent medium-term conditions improve, it's challenging to accept these prices as being reasonable.

It's always necessary to consider the ever-present spectre of investment risk. We've identified 2 warning signs with Academy of Environmental Planning and DesignLtd. Nanjing University, and understanding these should be part of your investment process.

Of course, you might find a fantastic investment by looking at a few good candidates. So take a peek at this free list of companies with a strong growth track record, trading on a P/E below 20x.

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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.