Teachable and Udemy are two of many, but these are the most prevalent, and they’re both intuitive and user-friendly. With Teachable, you have more control over your pricing and the look and feel of your course, but you don’t get a built-in audience. Instead you have to do all the marketing yourself. Udemy has a built-in base of students, but you don’t have as much control and they take more of your revenue.
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.