One of the things I'm surprised your article doesn't mention is the tax advantages of this type of investment. The depreciation and rehab costs (purchasing distressed properties) can be huge deductions to ones income taxes, which none of the others have. Then, along with the appreciation of real estate, this passive income investment outperforms the notion of maxing out my 401k as well.
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.
Residual income is often also referred to as, “passive” or “recurring” income. Indeed, money makes the world go ’round. What better way to earn money than through letting money work for you even while you sleep? Surely, no greater method is available or even imaginable. The key here is to work smarter, not harder. Industriousness is required and you should be prepared to be very persistent. A common method of steadily earning residual income is through royalties earned from a book, song composition, software, or mobile application. Types of recurring income are not limited to royalties. Here are ten methods to begin earning.
One thing I’ve learned working for myself and building passive income is that you absolutely must have different income sources. Any one of these residual income strategies can make you a lot of money but to really find financial independence, you can’t depend on just one stream of income. Diversify your income by putting together a strategy of multiple streams of income and you’ll never have to worry about money again!
Plenty of online marketplaces exist to sell web design, writing, and other common skills. But one marketplace in particular, People Per Hour, allows you to sell a well defined service. For instance, if you studied interior design, you could set a fixed price to design someone’s studio apartment. The marketplace is great and allows you to be more creative with what you can offer based on your actual background.
Residual income is really the best Way of Life. It's a steady, reliable stream of income not directly dependent on the hours you work. Successful investors enjoy such freedom. Successful book authors get paid even when they don't write. The checks just keep coming uninterrupted, even when you relax. This is much better than hourly work. Much better that salaried work. 
Or you could do joint ventures/strategic alliances for your business or for other businesses and make residual cash flow for $0 investment.. that’s what I do lol. No money, no risk, little time, 20+ years working from home. Just connect companies and take a %, use the Internet to do it locally or globally, be the intermediary & connect companies…. ;-)
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.
According to Uncle Sam, you need to be "materially involved" in an enterprise to earn active income. With passive income, it's just the opposite, as the IRS deems you to be earning passive income if you're not materially involved with a profit-making enterprise. By and large, expect income to be taxable if you are engaged in a passive income enterprise. You will need to report earnings to the IRS.
Residual income can have two different definitions or applications. The first definition, a less common application of residual income, is the money that is left after monthly debts are paid. This calculation is particularly important when a person is seeking financing or a loan based on their income and available money to cover the additional debt. In this scenario, the residual income is calculated by this formula: