This document discusses capital structure and its determinants. It defines capital structure as the mix of different securities used to finance a firm's operations, including bonds, loans, ordinary shares, and preferred shares. It then lists and describes various determinants that must be considered when determining a firm's optimal capital structure, including financial leverage, growth and stability of sales, cost of capital, cash flow ability, nature and size of the firm, control, flexibility, requirements of investors, capital market conditions, assets structure, purpose and period of financing, costs of floating securities, personal considerations, corporate tax rates, and legal requirements. Finally, it briefly outlines four major capital structure theories: the net income approach, net operating income approach, Modig