The circular flow of income or circular flow is a model of the economy in which the major exchanges are represented as flows of money, goods and services, etc. between economic agents. The flows of money and goods exchanged in a closed circuit correspond in value, but run in the opposite direction. The circular flow analysis is the basis of national accounts and hence of macroeconomics.
In addition to an extra income stream, residual income allows you to diversify your revenue sources. Instead of relying on your standard paycheck, you’re earning money through the royalties of an eBook or the sales of an online course. Diversity of income gives your overall financial portfolio more security and depth. Similar to passive income, residual income gives you more financial stability, flexibility with your lifestyle, additional retirement savings, and a more robust financial standing.
Creating multiple streams of income does not mean get a second job to supplement your current income. A second job does not provide you with the flexibility and freedom to increase your income. In fact, it can hurt you when you think about it. You are trading time for money and in the long run, you lose. Instead, create something that will allow you to give yourself a pay raise when you need and want it. 
Thank you for specifics that you write about as it helps educate a lot of us that do not have the experience and knowledge that you have acquired. I have been practice writing a travel blog about our upcoming month long trip to France with the hubby and two sons ages 12 and 10 and your site constantly gives me little boosts to keep working toward this goal!
Betterment – Betterment was the first robo-advisor to launch, almost ten years ago. They’ve automated the entire investing process, so all you have to do is watch your portfolio of assets grow (over the long run, of course). They do charge a .25% annual fee of your account total, so if you’ve got $100,000 that’s being managed by Betterment, you’ll pay just over $20 per month.

Value tends to be recognized earlier in the RI approach than in other present value-based approaches. To see this, recall that with a dividend discount model or free cash flow to equity model, a large portion of the estimated intrinsic value comes from the present value of the expected terminal value. Yet the uncertainty of the expected terminal value is usually greater than any of the other forecasted cash flows because it occurs several years in the future. Valuation with residual income models, however, is relatively less sensitive to terminal value estimates, which reduces forecast error.

Peerstreet – This residual income option is slightly different, helping you earn money using real estate backed loans instead of the property itself. By helping fund the loan, you’ll earn a percentage of the interest rate charged to the borrower. Most loans are short-term, generally lasting between 6 and 24 months. You can build your own portfolio by choosing the exact loans you’d like to fund, or Peerstreet will choose the loans for you. Again, you need to be an accredited investor, although the minimum investment here is just $1,000.

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.
Therefore, since the leakages are equal to the injections the economy is in a stable state of equilibrium. This state can be contrasted to the state of disequilibrium where unlike that of equilibrium the sum of total leakages does not equal the sum of total injections. By giving values to the leakages and injections the circular flow of income can be used to show the state of disequilibrium. Disequilibrium can be shown as:
Perhaps a coworker purposefully tries to make your life miserable because they resent your success. Maybe you get passed over for a promotion and a raise because you weren’t vocal enough about your abilities, and mistakenly thought you worked in a meritocracy. Or maybe you have a new boss who decides to clean house and hire her own people. Whatever the case may be, you will eventually tire.
3) Start as soon as possible. Building a livable passive income stream takes a tremendously long time largely due to declining interest rates since the late 1980s. Gone are the days of making a 5%+ return on a short-term CD or savings account. Today, the best 12-month CD is at 2.5%, and the best money market rate is around 1.85%, which is not bad considering such rates were below 0.5% just a couple years ago. Know that every $100 you save can generate at least $2.5 in passive income.
Investing in coins and collectibles: Buffalo nickels and Spiderman comic books are good examples of coins and collectibles that can rise in value, and thus offer opportunity for passive income investors. You'll need to get up to speed on the value of any coin or collectible under consideration, but once you do so, you're on the way to price appreciation on a commodity you'll be paying a lower price to buy, and will garner a higher price when you sell.
Rich people know the secret to wealth and peace of mind - and that is - having many cash-streams coming into their lives (and accounts!) instead of just one. One cash flow - say a salary or profit from a business - will not provide security in all times. On the other hand, multiple cash-flows provides stability and security. In case one cash-flow vanishes or reduces, the other one gives you comfort and sustenance.

Lending Club went public in 2014 and is now worth about $1.7B. They advertise P2P lending returns of over 7% for well-diversified portfolios of over 100 notes. I’ve personally been able to achieve a 7.4% annual return over the past two years in a completely passive way by investing in A and AA notes. Others have achieved a 10% annual return through relatively minimum effort.

Leonardo da Vinci is another example of someone who was a "wide achiever," in the words of Roman Krznaric, author of "How to Find Fulfilling Work." Da Vinci was alternately a portraitist, an inventor, and a scientist. Krznaric says that in light of decreasing job security today, spreading yourself among several different jobs, as da Vinci did, is probably a smart thing to do.

Finally, make sure you can service multiple types of clients. This is the best egg to have. Even for something as simple as a dog walking business, you can service multiple types of clients. For example, you can offer a puppy walking service and an adult walking service. You can have weekends at the park services. You can offer to take the dog to the groomers. Try to meet client’s individual needs.
No matter what venture you undertake in life, you need a team.  I’m a firm believer in team work, even if it is just to bounce ideas off of, or to have someone tell you that you are off track.  For many individuals, this person is their spouse, who also brings some income diversity to the table.  Just like I mentioned above, if your spouse has income, try to maximize it.
"I found out at about PJ because we happened to be in the same place at the same time ... some people call that a coincidence; I call pure and solid good luck. We quickly learned that we both were in business to help other people succeed, but little did I expect it would be PJ who helped me (instead of the other way around). I am now on target to have over 40,000 students take my online continuing education and training course. And all because of some simple tricks-of-the trade taught by PJ. I would recommend PJ to people who need to create an online business and also want to ramp that business up so that it can become a full time income. In Great Faith, Cathy He helped make it possible for me and when you put into practice what he teaches, it can possible for you, too. "
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: