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Historical Success
Although past results are no guarantee of future performance, they are the only certain data we have for judging a company’s strength and a management’s credibility.

REVENUE AND EPS: Do They Make Money?
The most quoted statistic is earnings per share (EPS), the bottom line. Generally I look for companies that have positive earnings, but the stated EPS can be misleading if it is the result of special circumstances or some creative accounting.

That’s why I consider revenues, the top line, to be more indicative of a company’s direction. Not just whether revenues have increased over the last quarter and year, but have they been increasing for several years in a row. There is seldom a good reason for a decline in sales, and a continual increase in revenues clearly indicates a business’ strength.

Are They a Good value?
A commonly used measure for a company’s value is the P/E (price divided by earnings per share). The P/E is sometimes called the “multiple” because that number times the earnings is the price investors are willing to pay for a stock.

The P/E for the S&P 500 Index fluctuated between 5 and 27 for over 100 years until 1998, when it surpassed 27 and continued upward into the 40s. It is now either 18, if you use pro forma or operating earnings from corporate reports, or 30, if you use net GAAP, generally accepted accounting principles. Therein lies the problem with using only P/E as a guide to value—it can be manipulated by accounting, limiting its usefulness as a measure of value.

A positive P/E means the company has positive earnings, but a high P/E could mean that the stock price is already higher than it should be. A low P/E could identify an attractively priced company. As a rule of thumb I look for stocks with P/Es lower than or not much higher than the S&P multiple, using GAAP.

If a stock’s P/E is very low, selling pressure may have driven the price down because of a negative recent event, such as the loss of a successful CEO, devastating news about one of their products, or a scandal or major setback involving another company in the same industry. The key is to determine if there are real, ongoing problems for the company, or are the low prices excellent buying opportunities, because the bad news is temporary.

If the P/E is high, the stock may be over-valued, but it might also mean that this company is expected to achieve exceptional growth in the near future. See P/E/G later in this article.

For the reasons already mentioned, the P/E should not to be the only measure of a company’s value. A more accurate, less likely to be manipulated measure is often the Price to Sales (P/S), the price per share divided by the sales per share. This is better because the top line, the revenues, cannot be tweaked by accounting. Also, if earnings are negative, the P/S ratio can still be used to compare performances, but the P/E ratio becomes useless. The P/S allows you to clearly compare how much companies cost per how much they make in revenues.