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?
Book sales ($36,000 a year): Sales of How to Engineer Your Layoff" continue to be steady. I expect book sales to rise once the economy starts to soften and people get more nervous about their jobs. It's always best to be ahead of the curve when it comes to a layoff by negotiating first. Further, if you are planning to quit your job, then there is no downside in trying to engineer your layoff so you can get WARN Act pay for several months, a severance check, deferred compensation, and healthcare.
What I did: I first identified my favorite places in the world to live: San Francisco, Honolulu, Paris, Amsterdam, New York City, and Lake Tahoe. I then looked up the median rent and housing prices for each city. Then I factored in private education costs for two kids to be conservative given I may not have two kids and public schools are often good enough. After calculating all vital costs, I then did a self-assessment of how happy I was making $50,000, $100,000, $150,000, $200,000, $250,000, $350,000, $500,000, and $750,000. I decided working 20 hours a week making $200,000 a year is the best income balance for maximum happiness. 
If you’re a YouTube personality, this is how you generate your income. An amazing example of this how Antonio Centeno got 1 million YouTube subscribers. If you’re a blogger who gets a lot of traffic to your site and uses advertising or sponsorships, then you’re also following the AA Model. Got a podcast with sponsorships? Same deal. I talk about successful podcast sponsorships and other ways to make money podcasting here:
Now that we have the model built, we can play with the variables to see what effect they have. In the spreadsheet above, go to cell B11, and change the Conversion rate for invites (conv%) to 5%. This will make the Viral Coefficient less than 1. Now look at what that did to your population growth. Instead of continuing to grow, it grows to 20 people, and then stops.
Agreed but I might consider a blended portfolio of large and small cap stocks using low cost mutual funds (I found a fidelity large cap fund FUSVX with a net expense of .035% that has also delivered 17%+ YTD gains, some are dividend some are growth stock in the fund) UNLESS you’re close to retirement. This way you get the growth upside on small cap paired with the stablilty of some large cap stocks while maintaining balanced ricks.
Look at products such as Hotmail, Facebook, YouTube, Gmail, Snapchat, dating websites, and Craigslist. They all have one thing in common: they are products that went viral. These are the ideal viral marketing opportunities as these products get better when more people use them. I don’t to discuss these properly, but it’s essential to know that they exist for a complete view of viral marketing.
As an individual, you need to determine what stage of your life cycle you are in right now. Are you single? Are you married with no children and dual income? Will your spouse leave his or her job if you decide to have kids? Are you nearing your retirement? These are simple questions which you need to ask yourself and clearly establish answers for them. The benefit of this exercise will be enormous because your life cycle will determine your saving and consumption patterns, and thus, you can easily decide on how much passive income you require.
On-demand: More than a decade after “The Blair Witch Project” and its viral-before-viral-was-a-thing campaign, the producers of “Paranormal Activity,” who made their 2007 film for about $15,000, invited those interested in the film to demand their local theaters show the movie. The result? A wide, nationwide release and more than $107 million in box office revenue in the U.S. alone. (2, 3)

Acorns: Acorns is a great way to start investing and building wealth. As it turns out, Acorns will pay you $5 to start investing with them for as little as $1. That’s a 500% return, plus it’s probably time you started investing for your future. They even have features like round-up and found money that allows you to get free money from places you already shop at.

While compiling this list, I did my best to avoid scams, and stick with practical ideas that work. I have tried many (but not all) of these ideas. Some of these helped me earned a few dollars here and there, but there are some that helped me earn extra money on the side every single day — and some are still providing me with revenue! Note that not all ideas will fit your skills and abilities. What works for you depends on your abilities and your current financial situation.
Market concentration is used when smaller firms account for large percentage of the total market. It measures the extent of domination of sales by one or more firms in a particular market. The market concentration ratio is measured by the concentration ratio. Description: The market concentration ratio measures the combined market share of all the top firms in the industry. ‘Market Share’ is us
I will share what we did, because it’s an incredible success story. We used an existing tax loophole where if you sell your primary residence (after having lived there at least two years) you get to keep your profit tax-free. So, we stair-stepped. We bought house after house, at least two years apart, used the profit money to pay down on the next house (so on and so forth, yadda yadda) building up equity as we went along… and now, we own a $600,000 house debt-free. And now we are using our paid-off home as leverage to borrow money to buy commercial buildings to rent out. I like commercial because it’s a BUSINESS transaction… kids, pets, other wear and tear that you see with residential rentals is nonexistent. People take care of their business space much better than residential. You have to be in a good area for renting out commercial – a thriving business community – to make this work. But that’s how we “made it”, and though it took 15 years, we will have residual income to take care of us when we’re old enough to retire. People made fun of us for moving so much, but who’s laughing now? 😉 Oh, and our child only had to change schools once (and we wanted to anyway) because we stayed in the same general area as we moved around. We were careful not to disrupt his life too much.
Real-estate crowdfunding ($9,600 a year): Once I sold my SF rental, it was natural to reinvest some of the proceeds into real-estate crowdfunding to keep sector exposure. I didn't invest a lot in some of my favorite real-estate investment trusts because I felt a rising interest-rate environment would be a stronger headwind for REITs. But if I could be more surgical with my real-estate investments by identifying specific investments in stronger employment-growth markets, I thought I could do better.

Thanks for the great article…although I have to point out many of the items listed are not passive but active, such as selling bodily fluids, writing blogs or resumes, and collecting bottles and cans. To be truly passive, the income source must require no effort on your part (after initial setup). Real estate, dividends, P2P lending…these are truly passive income sources.

If you were Prismacolor, you would promote this GIF because the more viral it becomes, the more chances it has of reaching an artist who may be interested in buying colored pencils for themselves or as a gift. And the more likely that artist is to choose Prismacolor if the viral image of their pencils inspired them to make the purchase. As the vendor, Prismacolor wants to increase sales of their products from all vendors.
What I did:The first two years of work in NYC was brutal. I told myself there was no way I could work on Wall St for my entire career because I’d probably die from heart failure by age 40. Having an early death in my mind willed me to save 50%+ from the first year onward and devise a CD, real estate, and stock investment distribution system for my savings every year. I thought about starting this site for at least a year before I hired someone from Craigslist to give set me up and push me forward. Hiring someone to get started is totally worth it if you are a master procrastinator. You can now learn how to start your own site with my step-by-step guide to save yourself time and money. 
I have six rental units which are a good source of passive income. I don’t use a property manager because you are right…they take about 10% of your rent. There are really only 2 things that tenants call about: 1. A plumbing issue 2. Heat/Air problems. Just find a plumber and heat/air guy you can trust. I travel a lot for my primary job. When a call comes in from a tenant, I can call the repair guy in just as easy as a property manager.
The campaign didn’t target Dove’s products but instead focused on changing a woman’s perception of how she sees herself, also changing the way how Dove is viewed as a company. It is said that “Woman aged between 18-34 are twice as likely to think highly of a brand that made an empowering ad and nearly 80% more likely to like, share, comment, and subscribe after watching one.” Through the video, Dove wanted to make women realize that they are overly-critical of themselves to make them feel better about their appearance.
The term viral strategy was first used in marketing in 1995, in a pre-digital marketing era, by a strategy team at Chiat/Day advertising in LA (now TBWA LA) for the launch of the first PlayStation for Sony Computer Entertainment. Born from a need to combat huge target cynicism the insight was that people reject things pushed at them but seek out things that elude them. Chiat/Day created a 'stealth' campaign to go after influencers/opinion leaders, using street teams for the first time in brand marketing and layered an intricate omni-channel web of info and intrigue. Insiders picked up on it and spread the word. Within 6 months PlayStation was number one in its category—Sony's most successful launch in history.