Returns on real estate investing vary and you don’t want to get into the business based on an estimated return but on your own calculation of what is possible for your local market and for specific properties. I have seen pretty common averages between 8% and 12% a year for single-family residential rentals with cash flow accounting for between 0% and 6% of the return.
Michael Ellsberg is the author of The Education of Millionaires: It’s Not What You Think, and It’s Not Too Late, which is launching from Penguin/Portfolio in September. It’s a bootstrapper’s guide to investing in your own human capital at any age. Michael sends manifestos, recommendations, tips, and other exclusive content to his private email list, which you can join at www.ellsberg.com. Connect with him on Twitter @MichaelEllsberg and on Facebook.
Similiar to Adsense, Media.net powers the Yahoo! Bing Network Contextual Ads and is probably the second largest contextual advertising company in the world. I've been running some Media.net ads for a few months and the income was very similiar to adsense. Bear in mind that their approval process is a bit more extensive than Google AdSense. -One has to get a certain number of page views monthly to get an account with them.
Self-publishing has the potential to be a very lucrative source of income. However, it does involve both an investment of your time and finances. It’s very important that you get the right help from the beginning. There are many considerations that may be outside of your expertise. Rory Carruthers, a sought-after book development, book launch, and book marketing consultant, says that six-figure launches require careful orchestration and planning. “Bestsellers aren’t just born out of great talent. They are also a product of thought-out marketing and well-orchestrated book launch campaign. It’s no longer enough to just write a good text. You need to think one step ahead and warm up your audience to the book even before you finish the first draft,” he said.
Writing an e-book is very popular among bloggers, as many have noted that “it's just a bunch of blog posts put together!” You will not only have to make an investment of time and energy to create the e-book, but market it correctly. However, if marketed correctly (through blogging affiliates in your niche, for example), you could have residual sales that last a very long time.

If you have specialized knowledge in a certain topic, you can put together an online course to teach others. For example, if you have experience in real estate investing, you can create an online course “Real Estate Investing 101”. The benefit of an online course is that once you create the course material, you can sell it to as many people as you want.

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