The Shanghai Jiaoda Onlly Co.,Ltd (SHSE:600530) share price has done very well over the last month, posting an excellent gain of 40%. The last 30 days bring the annual gain to a very sharp 63%.

Since its price has surged higher, given around half the companies in China's Personal Products industry have price-to-sales ratios (or "P/S") below 3.8x, you may consider Shanghai Jiaoda OnllyLtd as a stock to avoid entirely with its 10.6x P/S ratio. Although, it's not wise to just take the P/S at face value as there may be an explanation why it's so lofty.

How Shanghai Jiaoda OnllyLtd Has Been Performing

For instance, Shanghai Jiaoda OnllyLtd's receding revenue in recent times would have to be some food for thought. It might be that many expect the company to still outplay most other companies over the coming period, which has kept the P/S from collapsing. However, if this isn't the case, investors might get caught out paying too much for the stock.

What Are Revenue Growth Metrics Telling Us About The High P/S?

There's an inherent assumption that a company should far outperform the industry for P/S ratios like Shanghai Jiaoda OnllyLtd's to be considered reasonable.

Taking a look back first, the company's revenue growth last year wasn't something to get excited about as it posted a disappointing decline of 22%. This means it has also seen a slide in revenue over the longer-term as revenue is down 17% in total over the last three years. Therefore, it's fair to say the revenue growth recently has been undesirable for the company.

Comparing that to the industry, which is predicted to deliver 23% growth in the next 12 months, the company's downward momentum based on recent medium-term revenue results is a sobering picture.

In light of this, it's alarming that Shanghai Jiaoda OnllyLtd's P/S sits above the majority of other companies. It seems most investors are ignoring the recent poor growth rate and are hoping for a turnaround in the company's business prospects. Only the boldest would assume these prices are sustainable as a continuation of recent revenue trends is likely to weigh heavily on the share price eventually.

The Final Word

Shanghai Jiaoda OnllyLtd's P/S has grown nicely over the last month thanks to a handy boost in the share price. We'd say the price-to-sales ratio's power isn't primarily as a valuation instrument but rather to gauge current investor sentiment and future expectations.

We've established that Shanghai Jiaoda OnllyLtd currently trades on a much higher than expected P/S since its recent revenues have been in decline over the medium-term. When we see revenue heading backwards and underperforming the industry forecasts, we feel the possibility of the share price declining is very real, bringing the P/S back into the realm of reasonability. Should recent medium-term revenue trends persist, it would pose a significant risk to existing shareholders' investments and prospective investors will have a hard time accepting the current value of the stock.

You should always think about risks. Case in point, we've spotted 1 warning sign for Shanghai Jiaoda OnllyLtd you should be aware of.

If these risks are making you reconsider your opinion on Shanghai Jiaoda OnllyLtd, explore our interactive list of high quality stocks to get an idea of what else is out there.

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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.