Common stock valuation methods include:
1. Discounting future dividends using the required return rate for the stock. This works best when dividends are constant or grow at a known rate.
2. Using the earnings per share and an industry benchmark PE ratio when dividends are not paid, as the PE ratio captures expected future earnings and dividend growth.
3. Special cases exist when dividends are constant forever or grow at a constant rate, allowing the stock value to be directly calculated using perpetuity or dividend growth models. However, these ideal cases are rare in practice.