This document discusses various models for valuing common stock, including:
1) The constant-growth dividend discount model which values a stock based on expected future constant dividend growth.
2) Multi-stage growth models which allow for different growth rates over time.
3) The earnings model which values a stock based on expected future earnings per share.
4) Relative valuation models which value stocks relative to comparable companies using ratios like price-to-earnings.
The document also provides an example application of the earnings model to a company with given earnings and return on equity.