Think of yourself. What are your interests, passions, and hobbies? What is the one field to which you could contribute with added value? Think of this as your UVP (Unique Value Propositions), formulated in terms of “I could be the number one resource on (…)”. Insert your field of choice at the end of that proposition, then try to make it as narrow as possible.
Residual income is calculated as net income less a charge for the cost of capital. The charge is known as the equity charge and is calculated as the value of equity capital multiplied by the cost of equity or the required rate of return on equity. Given the opportunity cost of equity, a company can have positive net income but negative residual income.