Blue Bird Corporation's (NASDAQ:BLBD) price-to-earnings (or "P/E") ratio of 12.8x might make it look like a buy right now compared to the market in the United States, where around half of the companies have P/E ratios above 19x and even P/E's above 34x are quite common. Although, it's not wise to just take the P/E at face value as there may be an explanation why it's limited.

Recent times have been advantageous for Blue Bird as its earnings have been rising faster than most other companies. One possibility is that the P/E is low because investors think this strong earnings performance might be less impressive moving forward. If not, then existing shareholders have reason to be quite optimistic about the future direction of the share price.

Does Growth Match The Low P/E?

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

Retrospectively, the last year delivered an exceptional 358% gain to the company's bottom line. Still, EPS has barely risen at all from three years ago in total, which is not ideal. Accordingly, shareholders probably wouldn't have been overly satisfied with the unstable medium-term growth rates.

Shifting to the future, estimates from the six analysts covering the company suggest earnings should grow by 15% per annum over the next three years. Meanwhile, the rest of the market is forecast to only expand by 11% each year, which is noticeably less attractive.

With this information, we find it odd that Blue Bird is trading at a P/E lower than the market. Apparently some shareholders are doubtful of the forecasts and have been accepting significantly lower selling prices.

The Bottom Line On Blue Bird's P/E

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 Blue Bird's analyst forecasts revealed that its superior earnings outlook isn't contributing to its P/E anywhere near as much as we would have predicted. When we see a strong earnings outlook with faster-than-market growth, we assume potential risks are what might be placing significant pressure on the P/E ratio. It appears many are indeed anticipating earnings instability, because these conditions should normally provide a boost to the share price.

The company's balance sheet is another key area for risk analysis. You can assess many of the main risks through our free balance sheet analysis for Blue Bird with six simple checks.

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 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.