A "good" price-to-earnings (P/E) ratio varies widely depending on the specific industry, historical growth rates, and prevailing macroeconomic conditions. Generally, a P/E ratio between 15 and 25 is considered a healthy baseline for stable, mature companies. Lower P/E ratios may suggest a stock is undervalued or facing temporary distress, whereas higher P/E ratios reflect aggressive growth expectations or potential overvaluation by market participants.