With a price-to-earnings (or "P/E") ratio of 32.7x AAR Corp. (NYSE:AIR) may be sending very bearish signals at the moment, given that almost half of all companies in the United States have P/E ratios under 17x and even P/E's lower than 9x are not unusual. Although, it's not wise to just take the P/E at face value as there may be an explanation why it's so lofty.

With earnings that are retreating more than the market's of late, AAR has been very sluggish. One possibility is that the P/E is high because investors think the company will turn things around completely and accelerate past most others in the market. You'd really hope so, otherwise you're paying a pretty hefty price for no particular reason.

Check out our latest analysis for AAR

Does Growth Match The High P/E?

The only time you'd be truly comfortable seeing a P/E as steep as AAR's is when the company's growth is on track to outshine the market decidedly.

Retrospectively, the last year delivered a frustrating 24% decrease to the company's bottom line. This has erased any of its gains during the last three years, with practically no change in EPS being achieved in total. So it appears to us that the company has had a mixed result in terms of growing earnings over that time.

Shifting to the future, estimates from the four analysts covering the company suggest earnings should grow by 87% over the next year. Meanwhile, the rest of the market is forecast to only expand by 10%, which is noticeably less attractive.

In light of this, it's understandable that AAR's P/E sits above the majority of other companies. Apparently shareholders aren't keen to offload something that is potentially eyeing a more prosperous future.

The Key Takeaway

We'd say the price-to-earnings ratio's power isn't primarily as a valuation instrument but rather to gauge current investor sentiment and future expectations.

We've established that AAR maintains its high P/E on the strength of its forecast growth being higher than the wider market, as expected. At this stage investors feel the potential for a deterioration in earnings isn't great enough to justify a lower P/E ratio. It's hard to see the share price falling strongly in the near future under these circumstances.

You always need to take note of risks, for example - AAR has 6 warning signs we think you should be aware of.

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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