I like the way you have listed the ways to earn extra income and was quite surprise that you did not make mention of network marketing, which is a way to make extra income without quitting your regular, though most people view mlm as a pyramid scheme but the real pyramid scheme is a regular 9 to 5, because you can only have one president of a company at any given time and network marketing business model to promote product that can be used is really cheap to join and can offer a substantial extra income or what do you think?

Our most significant source of income is Mrs. RB40’s earned income, but that will change when she retires in a few years. Luckily, our expenses are at a reasonable level and we don’t need to replace her whole income to keep the same lifestyle. For 2015, our other sources of income just about covered our cost of living. The high-tech antitrust settlement gave us a shove to get over the finish line. That’s just a one off, though. I’m not too worried because there are other ways to generate some income to make up for Mrs. RB40’s paychecks. Here are some of them.
Varolo is an advertising campaign that allows major corporations (like Coca Cola, Lysol, and others) to reach their target audiences with a high return on investment. Major corporations are desperately trying to find new ways to advertise to people as the newspaper continues to decline in demand and in an age of DVR. Varolo is the newest opportunity that actually pays you, the one being advertised to, to watch their advertisements. You can join the campaign and earn a little extra spending money by viewing and rating commercials and even trailers for major motion pictures. While the trick is to devote 5 to 10 minutes of each day rating what you see, you should also be motivated to invite others along through Facebook, Twitter and other social media so that you can increase what you profit each week.
The average population of counties with per capita incomes above the state's was twice as high (921,098) as those with a per capita income below the state average (546,543). Even this difference is minuscule when population density is considered: Counties with a per capita income above that of the state were eight times as dense on average (1,540.2 persons per square mile) than those with per capita income below that of the state (192.1 persons per square mile).
Generating multiple streams of income can have a major impact on your finances. Even an extra income of $500 each month could go a long way towards paying down debt or increasing your investments. We often hear about the importance of diversifying our investments, but diversifying our income streams is just as important, particularly in difficult economic times.

1) Save Like Nobody Owes You Anything. Passive income starts with savings. Without a healthy amount of savings, nothing works. Your overall “Money Strength” will be an F- if you do not build a financial nut. In our current low interest rate environment, you must save even more than before. It’s important to also realize that the savings I am referring to is AFTER-tax savings. You need to save money after contributing to your 401k and IRAs since you can’t touch pre-tax retirement accounts without a penalty until 59.5. Ideally everyone should max out their pre-tax retirement funds first, but if you don’t have enough funds and want to retire earlier then a decision to have more accessible post tax money will still work.

The website Fiverr.com lets people sell (and buy) all kinds of wacky services for just $5 a pop. Current services for sale include designing a visually-appealing signature, creating a customized sound effect, making a tough decision, and writing a personalized rap song. Just as with crafty projects, you don’t want to over commit to something that won’t earn you a big return, but if you have a skill that easily translates into a quick service, then this could be a good strategy for you.
OK, I know what you're thinking — maybe you're not a writer. However, as Tamez says above, chances are, you're an expert sy ~something~. Also, chances are that other people want to know what you know. So whether you write an eBook on dating or tips on how to fix your car, once you write, self-publish the book, and let it go, it can sit on a site like Amazon and sell itself. Of course, you can market it, too, but that's another story! Some sites let you keep most of the earnings, while others do not.
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.
The United States and its partners continue to face a growing number of global threats and challenges. The CIA’s mission includes collecting and analyzing information about high priority national security issues such as international terrorism, the proliferation of weapons of mass destruction, cyber attacks, international organized crime and narcotics trafficking, regional conflicts, counterintelligence threats, and the effects of environmental and natural disasters.
It’s obvious that stocks outperform real estate in terms of capital gains, but I would like to see S&P compare to Real Estate in SF, Manhattan, LA. Our house in NC was $80,000 20 years ago. It’s only $150,000 now. Same house in Santa Monica went from $200,000 to $1.8 million. People who happen to bought real estate in major metropolitan would have a natural positive association with real estate investment.

You can make money whichever way floats your boat. I got a lot of slack in this post for trading forex, but I live in one country, and need currency from three other countries where I own property and travel to often, so when one currency is cheap, I do take advantage of fluctuations. It may not be your thing, but the important part is that you have more than one source of income.

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Affiliate Marketing – Affiliate marketing is the practice of partnering with a company (becoming their affiliate) to receive a commission on a product. This method of generating income works the best for those with blogs and websites. Even then, it takes a long time to build up before it becomes passive. If you want to get started with affiliate marketing check out this great list of affiliate marketing programs.

Even if each patron only contributes a very small amount each month, it can still be a huge source of income. Take a look at the Patreon page for Kinda Funny, an internet video company. They have over 6,209 patrons which means an average of just $3 a month would be a monthly income of almost $19,000 – plus they get cheerleaders that are always happy to spread the word on their brand.
I knew I didn't want to work 70 hours a week in finance forever. My body was breaking down, and I was constantly stressed. As a result, I started saving every other paycheck and 100% of my bonus since my first year out of college in 1999. By the time 2012 rolled around, I was earning enough passive income (about $78,000) to negotiate a severance and be free.
While some people tend to use a savings account at the same bank where they have their checking account, make sure it's a high-interest one, not just a convenient one. "For short-term savings that you have parked in a savings account for easy access, you can often make more money just by researching whether you're getting the best interest rate," Goudreau says. "While many traditional banks offer as little as 0.1% interest on savings, online banks tend to offer higher interest rates. By switching to an account that offers 1% interest or more, you would be making 10 times as much just by moving the money."
Now, all that said, if capital (savings) grows faster than the growth of the economy, those with savings will see their wealth grow at a faster rate than those who rely on the growth of their income. While this is not an extension of Piketty's argument (you can't take an idea that applies to a population and a whole economy and boil it down to the individual like this), it's not an unreasonable conclusion to take and apply to your own life. (Piketty does talk about this on an individual level, but says it's more impactful for billionaires vs. millionaires – though we have limited data into individuals)

Although adding income streams takes time, creating them within your current business is faster and easier than starting completely new income streams from scratch. This method of generating extra sources of income works well for any size business in any industry. For example, Amazon.com started by selling books. Today it sells thousands of other products including its own product, the Kindle, is a print and digital publisher, and now produces television shows. Many service-based business owners add coaching and books to their income streams.

2007 Human Development Report (HDR), United Nations Development Program, November 27, 2007, p.25. (The report also notes that although India is rising economically, the bad news is that this has not been translated into accelerated progress in cutting under-nutrition. One-half of all rural children [in India] are underweight for their age—roughly the same proportion as in 1992.)
It’s obvious that stocks outperform real estate in terms of capital gains, but I would like to see S&P compare to Real Estate in SF, Manhattan, LA. Our house in NC was $80,000 20 years ago. It’s only $150,000 now. Same house in Santa Monica went from $200,000 to $1.8 million. People who happen to bought real estate in major metropolitan would have a natural positive association with real estate investment.
This is an interesting take and good advice for those who probably do not need to ever worry about becoming destitute. I’m sorry but too many of your options including your own list of income require quite a bit of initial investment/capital and these suggestions are useless to those living paycheck to paycheck. I’d like to see the average low to middle income household purchase additional property for rental, invest in their portfolio (if they can even start one), or even afford to have a vehicle or room to rent. Far too first world of a solution for the general public.

One thing I notice about the debates on both tax policy and income inequality is that a lot of people seem to have relatively hazy ideas about how income is earned in America, and how much of each kind of income there is. For example, if someone is earning $300,000 a year, where is their income likely to be coming from? How much revenue is drawn from capital gains taxes? And how is income distributed between corporate shareholders and workers? People don't tend to have very strong priors about the answers to these questions, because they simply haven't yet learned what the relative sizes of different sources of income actually are.