If you normally enjoy taking pictures or already have a huge collection of good quality photos that you personally took, you can cash in on them by selling them online. You can sell the same image several times and earn a steady stream of passive income from your existing gallery. You can even use your iPhone to conveniently take pictures, wherever you are.
Residual Income equals net income minus opportunity cost. So in the stock trading example, your residual income is $4,000 minus $6,000 or negative $2,000. As you can see, an investment can produce negative residual income even if it helps your money grow . A negative residual income means that you could have done better by another, risk-free approach. Some analysts refer to residual value as Economic Value Added. If your residual value is negative, you are not truly adding value with what you are doing.
Another great way to get started is to identify an area of interest you have. For instance, Robert Duff has been successful in building passive income by selling books on Amazon. Then, go out and start talking to people. Ask them, “What are you struggling with right now? What are your biggest pains? What’s something you wish existed that doesn’t?” That’ll give you some ideas about where to get started.
One of the reasons starting a blog is such a draw for people these days is the ability to generate “hands off” money. We are all longing to get out of the rat race. We want to travel, volunteer at our kids’ school, have time to do the activities we truly love instead of sitting in traffic on the way to and from work. And blogging can help make that happen.
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.
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.