The return on investment of a specific department within a company can be calculated by dividing the departmental net profits by the costs generated by that department. For example, if the sales department generates $500,000 in revenue and carries $400,000 in costs, its net profits are $100,000. The return on investment can be calculated by dividing the $100,000 in departmental profits by the $400,000 in departmental costs, which gives an ROI of 25 percent.
Investing in a business: Another good way to generate passive income is to invest in a business --even a small one -- in return for a percentage of the profits - just like Shark Tank, only smaller. Lending $10,000 to a local business that, for example, is working on a mobile app for Apple phones could lead to a passive income-generated share of the profits when that mobile app starts selling like hot cakes.
Nowadays, anyone can create and sell t-shirts online, even with minimal design skill and coding knowledge. You can create designs on t-shirt marketplaces that do it all for you, upload designs to print-on-demand vendors who dropship orders for you, or set up an online store and sell tees you print and ship yourself, which can be the most profitable option.

My esteemed marketing colleagues initially balked at the idea of creating products that generate royalties, so I can understand how creating something from nothing might be daunting for those who aren’t even in creative roles. However, realize there is this enormous world out there of photographers, bloggers, artists, and podcasters who are making a passive income thanks to the Internet.
However, with passive income, there is not a direct connection to time involved. Once the original work is completed, the income continues to come in as long as demand for the product or service exists. Each time a song is downloaded, the musician receives money as a passive income. They did not have to record the song again or do additional work for each download, yet they are paid for their original work.
Of course, there are large fast-food, pet store, and other enterprises that cost a great deal. However, consider a DVD rental machine, soda, or gum ball machines as more passive avenues to income. These require little maintenance, coins, bills, or revenue collected via credit cards, as well as periodic refilling of machines.  These machines are, perhaps, one of the more lucrative paths to a passive income with little input from you.
However, residual income typically has an expiration date, especially if it is being earned through a business. Effort must be continuously put into the business in order for someone to continue to receive residual income. Businesses must continue to market themselves in order to remain relevant. The best way to look at residual income in this sense is that it is a part-time job that earns full-time income.
If you’re a YouTube personality, this is how you generate your income. An amazing example of this how Antonio Centeno got 1 million YouTube subscribers. If you’re a blogger who gets a lot of traffic to your site and uses advertising or sponsorships, then you’re also following the AA Model. Got a podcast with sponsorships? Same deal. I talk about successful podcast sponsorships and other ways to make money podcasting here:
This world is a dangerous place to live, not because of the good people that often act in irrational and/or criminally wrongdoing ways within the confines of their individual minds, core or enterprise groups, but because of the good people that don’t do anything about it (like reveal the truth through education like Financial Samauri is doing!). Albert Einstein and Art Kleiner’s “Who Really Matters.”
Residual income is when you continue to get paid after the work is done. This includes royalties from books, movies, or songs and also income that comes from real estate or business investments where you don’t actually have to be present to earn it. For example, Bill Gates is still making a residual income from Microsoft even though he isn’t working there anymore.