Earn residual income through referring consumers to an established product or service. Use your site to advertise to the company or companies you are interested in providing referrals for. Referral efforts can be coupled with informative e-books, seminars, or articles about the product or service. Build your newsletter lists in the same manner, the difference being that you are directing consumers to a third-party business.
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.