Pool Corporation's (NASDAQ:POOL) price-to-earnings (or "P/E") ratio of 28.7x might make it look like a strong sell right now compared to the market in the United States, where around half of the companies have P/E ratios below 17x and even P/E's below 9x are quite common. However, the P/E might be quite high for a reason and it requires further investigation to determine if it's justified.

Recent times haven't been advantageous for Pool as its earnings have been falling quicker than most other companies. 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. If not, then existing shareholders may be very nervous about the viability of the share price.

How Is Pool's Growth Trending?

There's an inherent assumption that a company should far outperform the market for P/E ratios like Pool's to be considered reasonable.

If we review the last year of earnings, dishearteningly the company's profits fell to the tune of 24%. Regardless, EPS has managed to lift by a handy 20% in aggregate from three years ago, thanks to the earlier period of growth. So we can start by confirming that the company has generally done a good job of growing earnings over that time, even though it had some hiccups along the way.

Shifting to the future, estimates from the twelve analysts covering the company suggest earnings should grow by 6.8% per annum over the next three years. That's shaping up to be materially lower than the 10% each year growth forecast for the broader market.

In light of this, it's alarming that Pool's P/E sits above the majority of other companies. It seems most investors are hoping for a turnaround in the company's business prospects, but the analyst cohort is not so confident this will happen. There's a good chance these shareholders are setting themselves up for future disappointment if the P/E falls to levels more in line with the growth outlook.

What We Can Learn From Pool's P/E?

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 Pool currently trades on a much higher than expected P/E since its forecast growth is lower than the wider market. When we see a weak earnings outlook with slower than market growth, we suspect the share price is at risk of declining, sending the high P/E lower. This places shareholders' investments at significant risk and potential investors in danger of paying an excessive premium.

Before you take the next step, you should know about the 1 warning sign for Pool that we have uncovered.

It's important to make sure you look for a great company, not just the first idea you come across. So take a peek at this free list of interesting companies with strong recent earnings growth (and 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.