The simplest way to benefit from a rising market is to buy an index fund. When you buy individual stocks, you can make higher profits, but you also face the risk of under-performance. Investors in RPC, Inc. (NYSE:RES) have tasted that bitter downside in the last year, as the share price dropped 33%. That's well below the market return of 34%. On the other hand, the stock is actually up 27% over three years. The last week also saw the share price slip down another 5.5%.

Since RPC has shed US$76m from its value in the past 7 days, let's see if the longer term decline has been driven by the business' economics.

To paraphrase Benjamin Graham: Over the short term the market is a voting machine, but over the long term it's a weighing machine. One flawed but reasonable way to assess how sentiment around a company has changed is to compare the earnings per share (EPS) with the share price.

Unfortunately RPC reported an EPS drop of 59% for the last year. This fall in the EPS is significantly worse than the 33% the share price fall. So despite the weak per-share profits, some investors are probably relieved the situation wasn't more difficult.

You can see how EPS has changed over time in the image below (click on the chart to see the exact values).

It's probably worth noting that the CEO is paid less than the median at similar sized companies. It's always worth keeping an eye on CEO pay, but a more important question is whether the company will grow earnings throughout the years. Before buying or selling a stock, we always recommend a close examination of historic growth trends, available here..

A Different Perspective

RPC shareholders are down 31% for the year (even including dividends), but the market itself is up 34%. Even the share prices of good stocks drop sometimes, but we want to see improvements in the fundamental metrics of a business, before getting too interested. On the bright side, long term shareholders have made money, with a gain of 4% per year over half a decade. It could be that the recent sell-off is an opportunity, so it may be worth checking the fundamental data for signs of a long term growth trend. I find it very interesting to look at share price over the long term as a proxy for business performance. But to truly gain insight, we need to consider other information, too. Take risks, for example - RPC has 2 warning signs we think you should be aware of.

But note: RPC may not be the best stock to buy. So take a peek at this free list of interesting companies with past earnings growth (and further growth forecast).

Please note, the market returns quoted in this article reflect the market weighted average returns of stocks that currently trade on American exchanges.

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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.