It's not possible to invest over long periods without making some bad investments. But you want to avoid the really big losses like the plague. So consider, for a moment, the misfortune of Yonyou Network Technology Co.,Ltd. (SHSE:600588) investors who have held the stock for three years as it declined a whopping 71%. That'd be enough to cause even the strongest minds some disquiet. And the ride hasn't got any smoother in recent times over the last year, with the price 50% lower in that time. Shareholders have had an even rougher run lately, with the share price down 34% in the last 90 days.

So let's have a look and see if the longer term performance of the company has been in line with the underlying business' progress.

While the efficient markets hypothesis continues to be taught by some, it has been proven that markets are over-reactive dynamic systems, and investors are not always rational. One imperfect but simple way to consider how the market perception of a company has shifted is to compare the change in the earnings per share (EPS) with the share price movement.

Over the three years that the share price declined, Yonyou Network TechnologyLtd's earnings per share (EPS) dropped significantly, falling to a loss. Due to the loss, it's not easy to use EPS as a reliable guide to the business. But it's safe to say we'd generally expect the share price to be lower as a result!

The company's earnings per share (over time) is depicted in the image below (click to see the exact numbers).

It might be well worthwhile taking a look at our free report on Yonyou Network TechnologyLtd's earnings, revenue and cash flow.

A Different Perspective

While the broader market lost about 21% in the twelve months, Yonyou Network TechnologyLtd shareholders did even worse, losing 50% (even including dividends). However, it could simply be that the share price has been impacted by broader market jitters. It might be worth keeping an eye on the fundamentals, in case there's a good opportunity. Regrettably, last year's performance caps off a bad run, with the shareholders facing a total loss of 6% per year over five years. We realise that Baron Rothschild has said investors should "buy when there is blood on the streets", but we caution that investors should first be sure they are buying a high quality business. Shareholders might want to examine this detailed historical graph of past earnings, revenue and cash flow.

If you are like me, then you will not want to miss this free list of growing companies that insiders are buying.

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