Instead of developing multiple streams of income, the typical doctor spends 1-2 decades developing a single income source.  It might be the equivalent of the Amazon River, but even so, it can dry up surprisingly rapid.  Think about all the things that could put an end to your professional income.  Keep in mind that some of these can be insured against, but many cannot.  Here’s just a brief list off the top of my head:
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're looking to get started in real estate, look at a crowd funding solution like RealtyMogul. It works similar to LendingClub - you commit as little as $5,000 towards a property. When the property is fully funded, you become an owner, and will receive your share of the earnings and appreciation in the property.  Check out RealtyMogul to learn more. 

In mid-2017, I sold my San Francisco rental property for 30X annual gross rent and reinvested $500,000 of the proceeds in real estate crowdfunding. I’m leveraging technology to invest in lower valuation properties with higher net rental yields in the heartland of America. With the new tax policy starting in 2018 capping state income and property tax deductions to $10,000 and limiting interest deduction on mortgages of only $750,000 from $1,000,000, expensive coastal city real estate markets should soften at the expense of non-coastal city real estate.
The age old argument of total return versus income has been, incorrectly imo, categorized as an either or proposition. We are going to do both. Right now I have a lot cash in an on line money market. I also have investments in 2 passive Index funds in a taxable account. We then have substantial 401ks/IRA’s which we won’t touch for at least 10 years. My wife will continue to max out her sep and we will continue to invest in the index funds although with a smaller amount. We have already factored that in. I looked at how to cut into the monthly deficit. Here is what I observed.
Hi there. I am new here, I live in Norway, and I am working my way to FI. I am 43 years now and started way to late….. It just came to my mind for real 2,5years ago after having read Mr Moneymoustache`s blog. Fortunately I have been good with money before also so my starting point has been good. I was smart enough to buy a rental apartment 18years ago, with only 12000$ in my pocket to invest which was 1/10 of the price of the property. I actually just sold it as the ROI (I think its the right word for it) was coming down to nothing really. If I took the rent, subtracted the monthly costs and also subtracted what a loan would cost me, and after that subtracted tax the following numbers appeared: The sales value of the apartment after tax was around 300000$ and the sum I would have left every year on the rent was 3750$……..Ok it was payed down so the real numbers were higher, but that is incredibly low returns. It was located in Oslo the capital of Norway, so the price rise have been tremendous the late 18 years. I am all for stocks now. I know they also are priced high at the moment which my 53% return since December 2016 also shows……..The only reason this apartment was the right decision 18 years ago, was the big leverage and the tremendous price growth. It was right then, but it does not have to be right now to do the same. For the stocks I run a very easy in / out of the marked rule, which would give you better sleep, and also historically better rates of return, but more important lower volatility on you portfolio. Try out for yourself the following: Sell the S&P 500 when it is performing under its 365days average, and buy when it crosses over. I do not use the s&P 500 but the obx index in Norway. Even if you calculate in the cost of selling and buying including the spread of the product I am using the results are amazing. I have run through all the data thoroughly since 1983, and the result was that the index gave 44x the investment and the investment in the index gives 77x the investment in this timeframe. The most important findings though is what it means to you when you start withdrawing principal, as you will not experience all the big dips and therefore do not destroy your principal withdrawing through those dips. I hav all the graphs and statistics for it and it really works. The “drawbacks” is that during good times like from 2009 til today you will fall a little short of the index because of some “false” out indications, but who cares when your portfolio return in 2008 was 0% instead of -55%…….To give a little during good times costs so little in comparison to the return you get in the bad times. All is of course done from an account where you do not get taxed for selling and buying as long as you dont withdraw anything.
This equation is pretty simple and incredible useful for management because it looks at one of a department’s key components of success: its required rate of return. This component helps management evaluate whether the department is making enough money to maintain, close, or expand its operation. It’s essentially an opportunity costmeasurement based on the trade off of investing in capital in one department over the other. For instance, if management can invest company revenues in department A and earn a 15% return, department B would have to make at least 15% in order for the management to consider the investment. If department B doesn’t meet minimum 15% return rate, it might be shut down or redirected.
François Quesnay further developed these concepts, and was the first to visualize these interactions over time in the so-called Tableau économique.[3] Quesnay believed that trade and industry were not sources of wealth, and instead in his 1758 book Tableau économique (Economic Table) argued that agricultural surpluses, by flowing through the economy in the form of rent, wages, and purchases were the real economic movers, for two reasons.
I cut back on medicolegal work to free up time and reduce stress. I spend most of my time on medical directorship work and clinical practice. Free time is spent on exercising, travel, time with family, and blogging. I spend virtually no time on the other income streams at this point. Getting the plate spinning can be tough but then the momentum keeps them turning.
One of the benefits of the time we live in is all the software and technology we have available. If you want to scale a business that’s bigger than yourself, you’re going to need systems in place to get you there. These systems should involve automating as much as you can. The less involvement of you in the day-to-day means you have time to focus on the big picture strategies that help your business grow. 
The book is not bad but it's not that great either. Think of it as an idea book in which you see him mention something and then research it futher. The rambling just becomes too much as you move along to the point where it becomes annoying to read. The tone the author uses is very nonchalant and he doesn't really explain anything. Ideas are just thrown out.
Cantillon develops a circular-flow model of the economy that shows the distribution of farm production between property owners, farmers, and workers. Farm production is exchanged for the goods and services produced in the cities by entrepreneurs and artisans. While the property owners are “independent,” the model demonstrates the mutual interdependence between all the classes of people that Adam Smith dubbed the “invisible hand” in The Theory of Moral Sentiments (1759).[7]
​Self Publishing is mainstream today. When you purchase an eBook off of Amazon there’s a pretty good chance you’re buying a self-published book. Self-publishing is also ridiculously easy. I tried this a few years ago and couldn’t believe how simple the process was. To self-publish a book you’ll first need to write and edit it, create a cover, and then upload to a program such as Amazon’s Kindle Direct Publishing. Don’t expect instant success though. There will need to be a lot of upfront marketing before you can turn this into a passive income stream.

Successful YouTubers choose a theme for their channel—ranging from humorous commentary to gardening. As you acquire subscribers to your channel, your number of views becomes more consistent, which in turn grows your residual income. While you’ll need to produce regular videos to maintain your following, a couple hours of filming and editing pales in comparison to the revenue you can generate with minimum effort.
If you’re looking for a way to begin gradually replacing your income, these are just some of the best ways you can do it as a physician. Remember the idea of gradual retirement? Passive income streams like the ones mentioned here are perfect ways to allow you to spend more time with family, enjoy your day job more, and, of course, make a little money while you’re at it.

Let us start by creating a corpus to invest your money. Let us say you are 25 years of age and earning Rs.75,000 per month after completing your MBA. You can save Rs.10,000 per month in an equity fund as you have other commitments with the rest of the money. But starting off with Rs.10,000 per month in an equity fund SIP is not bad enough. Here is why.
We pitched to an angel investor group. They were very excited about the idea but wanted to know who amongst us (doctor, accountant, salesman) was doing the coding. When they heard we were outsourcing it, the wind went out of their sails immediately. They did want to meet with us again once we brought a coder on board but that person proved elusive to find. Coders in our area are looking for the steady paycheck, not willing to gamble on a startup.
Dividend investing is right up there for sure. You don’t have to charge $48. You can charge <$10 to boost sales. The internet has enabled so many creatives to publish their works at a low cost. People will surprise themselves if they try to create like when they were in school. The other reason why I have Creating Products edging out dividends is because of the much higher POTENTIAL to make a lot more money. For example, $20,000 a year in book sales requires $570,000 in dividend investments to replicate the same amount. Plus, there is capital risk. With book sales, there is a correlation with EFFORT, and you are not beholden to the whims of the markets.

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.
Injection means introduction of income into the flow. When households and firms borrow the savings, they constitute injections. Injections increase the flow of income. Injections can take the forms of investment, government spending and exports. As long as leakages are equal to injections, the circular flow of income continues indefinitely. Financial institutions or capital market play the role of intermediaries. This means that income individuals receive from businesses and the goods and services that are sold to them do not count as injections or leakages, as no new money is being introduced to the flow and no money is being taken out of the flow.
Many bloggers and social media influencers build significant residual income through affiliate partnerships. If a blogger promotes or mentions a product on their site, and readers purchase the product through the link provided, the blogger earns a percentage of the revenue. The same goes for social media influencers. If someone promotes a product on Instagram and their followers purchase it through their link, the Instagrammer would receive a portion of that revenue.
Residual value also figures into a company's calculation depreciation or amortization. Suppose a company acquires a new software program to track sales orders internally, and this software has an initial value of $10,000 and a useful life of 10 years. To calculate yearly amortization for accounting purposes, the owner needs the software's residual value, or what it is worth at the end of the 10 years. Assume this value is zero and the company uses the straight-line method to amortize the software. Therefore, the company must subtract the residual value of zero from the $10,000 initial value and divide by the asset's useful life of 10 years to arrive at yearly amortization, which is $1,000.  If the residual value were $2000, the yearly amortization would be $800 ($10,000 - $2,000/10 years).

The clarified order then divided Brad’s commissions into three separate categories. The first category represented the specific members and brokers that made up Brad and Karen’s downline as of their date of divorce. The second represented those new members and brokers that Brad had earned on his own after the date of divorce. The third consisted of new members and brokers that were earned by the brokers within the first category after the date of divorce.

"Multiple Streams of Income" by Robert G. Allen is a book is full of great information on how to free yourself from "the rat race." Although some of the information is outdated for our current economic climate, the information is still valuable, and heartily recommend the read. There are many chapters of relevant information to balance anything you may consider unusable. He teaches you that there are many ways to earn money outside of a regular job. He also leads you through determining which avenue is right for you, and gives you all the tools you need to get started on the basics. "Multiple Streams of Income" has helped me alot.
Making legitimate passive income isn’t as difficult as you might think. Some of the best passive income ideas might take a little time to set up but can start cash flowing within a couple of months and will provide a consistent monthly income for years or more. The most important point is just to get started. You make exactly $0 on the passive income sources you never start.

Making money in addition to a regular income can have a big impact on your finances. An extra $500 per month could go a long way in paying down debt or raising your investment. Diversifying your income streams is important, especially as wage remain stagnant. You decide how you want to produce the income. Either you ‘do something’ to generate the income- this is active income such as providing a service; or the income is generated without you having to ‘do anything,’ – this is passive income such as hosting an Airbnb. Just make sure you do not place all your eggs in one basket.

"The whole idea of Multiple Streams of Income will be a powerfulparadigm shift for most people. Bob Allen gives practical andbeautifully illustrated knowledge on how to do it. Masteringfinancial principles is an important habit in life because it givesus the freedom to focus on what matters most. A valuable read."—Dr. Stephen R. Covey, author of The 7 Habits of HighlyEffective People

The first application of residual income, the remaining money after debts are paid each month, is relevant when analyzing a person's financial status or ability to qualify for financing. The second application, the more widely recognized meaning of residual income, is money that is received on an on-going basis for work that is completed once. This form of income allows the recipient to generate revenue that is not based on time limits. Residual income is the foundation for wealth because it offers flexibility in earning and maximizing income. It also allows income to be generated long after the work has been done.