While it is important to find something that you love to do and turn it into a money making business, you do have to be cognizant of the return as you pointed out. There are many opportunities that I found and tried out that at the time seemed great. But when I took a step back, I realized that I was working a lot for very little income whereas other things I love doing brought in much more money.
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. 
The aviation industry experienced a rapid transformation following deregulation. Several low-cost carriers entered the Indian market in 2004–05. Major new entrants included Air Deccan, Air Sahara, Kingfisher Airlines, SpiceJet, GoAir, Paramount Airways and IndiGo. Kingfisher Airlines became the first Indian air carrier on 15 June 2005 to order Airbus A380 aircraft worth US$3 billion.[199][200] However, Indian aviation would struggle due to an economic slowdown and rising fuel and operation costs. This led to consolidation, buyouts and discontinuations. In 2007, Air Sahara and Air Deccan were acquired by Jet Airways and Kingfisher Airlines respectively. Paramount Airways ceased operations in 2010 and Kingfisher shut down in 2012. Etihad Airways agreed to acquire a 24% stake in Jet Airways in 2013. AirAsia India, a low-cost carrier operating as a joint venture between Air Asia and Tata Sons launched in 2014. As of 2013–14, only IndiGo and GoAir were generating profits.[201][needs update]
The financial services industry contributed $809 billion (37% of GDP) and employed 14.17 million people (3% of the workforce) in 2016, and the banking sector contributed $407 billion (19% of GDP) and employed 5.5 million people (1% of the workforce) in 2016.[153] The Indian money market is classified into the organised sector, comprising private, public and foreign-owned commercial banks and cooperative banks, together known as 'scheduled banks'; and the unorganised sector, which includes individual or family-owned indigenous bankers or money lenders and non-banking financial companies.[202] The unorganised sector and microcredit are preferred over traditional banks in rural and sub-urban areas, especially for non-productive purposes such as short-term loans for ceremonies.[203]
I just started out with Affiliate Marketing (idea # 8) and it is not as easy as people make out to be. For me the hardest part so far is learning Search Engine Optimization (SEO) and driving traffic to my website. I m only 3 months into it, but I am confident that the site will begin to generate some income, I have give it 6-9 months, so we’ll see.
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.
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. 
Great ideas here, and thanks for the link! I’m definitely interested in learning about using an Ebay store, although I’ve heard they are not as effective as they used to be. One interesting problem that arises though is with online work, that is, work performed via the internet. If one does not reside in one’s home country while doing it it might be considered illegal (so check on all those tax implications).
IDA has invested more than $2 billion since 1991 to address the country’s infrastructure gap, partly through the Road Sector Development Program (RSDP). IDA helped build capacity and establish a dedicated road fund for financing maintenance. Working in partnership with other donors, including the European Commission, Germany, Japan, Nordic countries and the United Kingdom, IDA helped increase both the size and quality of Ethiopia’s road network from under 20,000 km in 1991 to over 100,000 km in 2015. Under the CPF, the World Bank continues supporting improvements in transport infrastructure and road connectivity to reduce travel times and improve connectivity between markets and secondary cities.

The WBG, with the United Nations Development Programme and one bilateral donor, is one of the rotating co-chairs of the Development Assistance Group (DAG), the main forum for donor coordination in Ethiopia. Through DAG there are efforts to make progress on the implementation of commitments in the Paris and Accra Declarations, including joint economic and sector work (much of the WBG’s major analytical work has already been prepared with its partners) and joint missions. Much of the collective effort is focused on furthering harmonization through major multi-donor programs and policy areas of importance.
I just wanted to say how nice it is to see such a positive exchange between strangers on the Internet. Seriously, not only was this article (list) motivating and well-drafted, the tiny little community of readers truly were a pleasant crescendo I found to be the cause of an inward smile. Thank you, everyone, and good luck to you all with your passive income efforts!! 🙂
You can select any of the above-mentioned, based on your interest, skill, and capability to generate a second income source. However, these are just to name a few, there exist multiple ways to generate a secondary income channel. You just need to identify the right one, which suits you the best. Remember there is no shortcut to success and you need to work hard to be successful and rich in the long run!

Prime Minister Indira Gandhi nationalised 14 banks in 1969, followed by six others in 1980, and made it mandatory for banks to provide 40% of their net credit to priority sectors including agriculture, small-scale industry, retail trade and small business, to ensure that the banks fulfilled their social and developmental goals. Since then, the number of bank branches has increased from 8,260 in 1969 to 72,170 in 2007 and the population covered by a branch decreased from 63,800 to 15,000 during the same period. The total bank deposits increased from ₹59.1 billion (US$820 million) in 1970–71 to ₹38,309.22 billion (US$530 billion) in 2008–09. Despite an increase of rural branches – from 1,860 or 22% of the total in 1969 to 30,590 or 42% in 2007 – only 32,270 of 500,000 villages are served by a scheduled bank.[204][205]

E-Commerce is taking off in India. One of my friend runs ebay shop for second income and easily earn Rs 1 Lac per month. You don’t need huge investments to start your store. Besides ebay you can create your own e-commerce website without any hassles. Recently Shopify set shop in India. Shopify is leading E-commerce platform & provide ready solutions to launch e-commerce store i.e. no need of website designing.
Estimated GDP per capita of India and United Kingdom during 1700–1950 in 1990 US$ according to Maddison.[97] However, Maddison's estimates for 18th-century India have been criticized as gross underestimates,[98] Bairoch estimates India had a higher GDP per capita in the 18th century,[99][100] and Parthasarathi's findings show higher real wages in 18th-century Bengal and Mysore.[101][78] But there is consensus that India's per capita GDP and income stagnated during the colonial era, starting in the late 18th century.[102]
Nobody gets early FI investing in bonds, CD’s, or even stocks unless they make a huge income or are extremely frugal or a combination of both. Paper assets just don’t provide enough returns. Business income can be great but it is typically not as semi-passive as I would like and there is a relatively high failure rate. That is if you can monetize an ideal to begin with. RE investing needs to be higher ranked IMO as a way that the “average guy” can become FI.
Today I sent my Annual Message to the Congress, as required by the Constitution. It has been my custom to deliver these Annual Messages in person, and they have been broadcast to the Nation. I intended to follow this same custom this year. But like a great many other people, I have had the "flu", and although I am practically recovered, my doctor simply would not let me leave the White House to go up to the Capitol. Only a few of the newspapers of the United States can print the Message in full, and I am anxious that the American people be given an opportunity to hear what I have recommended to the Congress for this very fateful year in our history — and the reasons for those recommendations. Here is what I said …[4]

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.

These challenges are international in scope and are priorities for the Central Intelligence Agency. If you have information about these or other national security challenges, please provide it through our secure online form. The information you provide will be protected and confidential. The CIA is particularly interested in information about imminent or planned terrorist attacks. In cases where an imminent threat exists, immediately contact your local law enforcement agencies and provide them with the threat information.

This would only require the investment of your time. Start with a blog on something you love. It could be anything. From a travel blog containing pictures of your travels to a sports blog dedicated to your favorite team/sport. You can blog about anything and everything. It doesn't matter. But write regularly! I've read that an online magazine editor would personally prefer someone who posts something daily over someone who writes long posts once or twice a week.
If you want to top up your income without taking on a strenuous second job, your first port of call should be your very own skillset. If you have a natural talent that could help others, you have an instant “in” to easy money. Whether you’re a gifted guitarist, mathematical genius or speak a second language, almost any talent can be turned into cash. Offering one-to-one coaching is a flexible way to make a solid hourly rate, and enables you to take on as much or as little work as you wish. Find local clients by placing adverts in the library, schools and community bulletin boards and share your talent in exchange for a fee.
I've got a $185,000 CD generating 3% interest coming due. Although the return is low, it's guaranteed. The CD gave me the confidence to invest more aggressively in risk over the years. My online interest income has come down since I aggressively deployed some capital at the beginning of the year and again during the February market correction. You'll see these figures in my quarterly investment-income update.
Doesn’t it sound awe-inspiring to have more than one income source? You already have one source of work with a steady flow of income and then you are creating more and more work for you with more income for you. Who does not want to have lots of money in their bank accounts floating all around? For the person who values financial security and their ultimate dream is financial freedom, creating more than one source of income becomes a necessity not just desire.
To these human costs can be added the massive economic waste associated with the water and sanitation deficit.… The costs associated with health spending, productivity losses and labour diversions … are greatest in some of the poorest countries. Sub-Saharan Africa loses about 5% of GDP, or some $28.4 billion annually, a figure that exceeds total aid flows and debt relief to the region in 2003.Source 10

According to financial planners and advisors, retired people could invest in Debt accrual funds for higher post-tax income. These funds are more useful to those retired people who are in the higher income tax bracket (20% and 30%). For those who are in the 10% tax bracket, and also those who do not have to pay any taxes, bank fixed deposits are equally good, they say.
Hi, it’s probably been brought up before, but the statement “you can’t touch pre-tax retirement accounts without a penalty until 59.5” is incorrect. You can touch the traditional 401k accounts with a SEPP (substantially equal payment plan), and not pay the 10 percent penalty. You can also touch a Roth without the 10 penalty using the same strategy, although I understand you will pay taxes so you lose the Roth’s advantage. When I found this out, I stopped contributing to Roths because I wanted to retire early. Who knows if they will even live to age 59.5? So many people don’t!
I am an English major and a herbalist with so many ideas and no extra income to fulfill them. I recently started renting my extra apartment in the attic with Airbnb. It’s amazing how fast I accumulated some money for few hours of work between guests. Now I want to persue all my dreams of opening an online herbal store, publishing my ebook of treating Ulcerative Colitis with herbs, blogs, and videos, and pretty much all of the ideas mentioned here. I will save this article as its really helpful for whomever needs some ideas…
If you want to really start tracking your finances, and I mean not just your spending but your investing (that's where wealth is built), give Personal Capital a look. They will give you a $20 Amazon gift card if you link up an investment account that has $1,000+. No strings. It's a cornerstone of my financial system and I think you owe yourself a look. 100% free too.