The document discusses the cost of capital and its components. It defines cost of capital as the minimum rate of return that a firm must earn on its investments to maintain the market value of its equity. It then discusses the different methods to calculate the cost of debt, preferred shares, retained earnings, and equity. This includes formulas to calculate costs based on book yields, market yields, growth rates, and tax adjustments. It concludes by explaining how to calculate the weighted average cost of capital using both book value and market value weights for the different capital components.