The P/E ratio, or price-to-earnings ratio, is a measure of how much investors are paying for every $1 of a companys earnings. A good P/E ratio is one that is lower than the average P/E ratio, which is typically around 20 to 25. However, the difference between a good and bad P/E ratio is not always cut and dry, and it is important to use the ratio in a comparative sense. Ultimately, there is no hard-and-fast rule for what a good P/E ratio is, and it depends on factors such as the stability of earnings and the likelihood of future growth. Value investors generally prefer firms selling at lower P/E ratios, as they believe these stocks are undervalued. It is important to note that a high P/E ratio can mean that a stock's price is high relative to earnings and possibly overvalued, while a low P/E ratio might indicate that the current stock price is low relative to earnings.