This document discusses capital structure and related concepts over multiple chapters. It defines capital structure as the mix of different sources of long-term financing like equity shares, preference shares, debentures, and retained earnings. It also discusses the differences between capital structure and financial structure. An example is provided to demonstrate how to calculate the capitalization, capital structure, and financial structure of a company based on information from its balance sheet. Factors that determine optimal capital structure and theories related to capital structure are also outlined.