When you write a blog post on your website, that article immediately goes out to your followers. But the content also remains on the website for others to find via search engines or social media. Each time somebody reads your content, there’s the potential to serve them an ad, product for purchase, or affiliate link (many links in this post are affiliate links). Each set of eyeballs that read your content carry the potential for passive income.
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.