The optimal capital structure is the mixture of debt and equity which maximizes the market price of the firm's bonds.

Optimal Capital Structure

The proportional mix of debt and equity financing that minimizes a company's cost of capital and maximizes its value.

Market Price

The market's ongoing price for an asset or service available for sale or purchase.

Firm's Bonds

Long-term debt securities issued by a corporation to finance its projects and operations, typically offering regular interest payments to the holder.