There is an increase in profit earned by equity shareholders because of the presence of fixed financial charges. This concept is:

Option 1: Trading on debt -> Refers to using borrowed funds, but not the technical term for equity shareholders benefiting from fixed charges.

Option 2: Trading on equity -> The practice of using debt with fixed financial charges (interest) to increase returns to equity shareholders; also called financial leverage.

Option 3: Trading on fixed capital -> Not a recognized financial concept; fixed capital refers to long-term assets, not a leverage strategy.

Option 4: Operating leverage -> Relates to the mix of fixed and variable operating costs, not financial charges or debt structure.

Hence, Option 2: Trading on equity -> When a company uses debt (with fixed interest charges) and earns returns higher than the interest cost, the surplus profit accrues to equity shareholders, magnifying their returns. This is the concept of trading on equity or financial leverage. -> correct