Passive income is defined by Wikipedia as “income resulting from cash flow received on a regular basis, requiring minimal to no effort by the recipient to maintain it”. And while the ‘no effort’ part of the definition is very enticing, the truth is that generating passive income requires a massive amount of effort. And this effort needs to be exerted up front and then sustained for months, and maybe even years, until your venture starts returning profits. And even then, you'll have to monitor your income streams to make sure it’s all going smoothly. It's certainly not an easy endeavour, no matter what most people may tell you, and it requires an investment of something far more valuable than money: time. But if you are up for it, then here are 14 ideas that you can use to start earning passive income.
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?
The craziest part of this was I’d wake up in the morning and there would be more money in my bank account, from people who had bought my book overnight. When you think about it, an online store that sells something that’s digital is something that’s open 24 hours a day, 7 days a week, 365 days a year. Using tools, software and systems, you can automate the delivery process so you literally don’t have to do anything to serve that audience. That’s super powerful.
Part of providing value is building trust. Don’t link to things that aren’t of good quality or people won’t trust your recommendations. The other part of making an audience is consistency. It matters less how often you post than how consistently. If you only have time to do one post a month, that post should come out on the same date and time each month.
Taking Paid Surveys at Home: I was skeptical, at first, until my 17 year old son starting making money at home taking paid surveys. Companies desperately want your opinion, and they are willing to pay for it. The trick, of course, is knowing where to find the paid surveys that pay the best. One of the most popular and legitimate survey sites is Swagbucks. Not only can you make money taking surveys, but you can also make money by watching videos and even surfing the net. They also offer significant cash back for online shopping.
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. 
I first discovered the power of passive income when I was a senior in high school. I started a mobile billboard business where I would rent a small piece of land from someone who had land along a busy highway. Then I would place one of my billboard trailers on the land and rent out the ad space on the billboard. I would usually charge about $300 per month for the ad space, meanwhile I was only paying $50 per month to the landowner for the ground rent. I got to the point to where I had 9 billboard faces and was making quite a substantial income for someone in high school. I really learned how passive income could free up my life… this business is what lead me into investing in real estate.
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.

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).
India's infrastructure and transport sector contributes about 5% of its GDP. India has a road network of over 5,472,144 kilometres (3,400,233 mi) as of 31 March 2015, the third-largest road network in the world behind United States and China. At 1.66 km of roads per square kilometre of land (2.68 miles per square mile), the quantitative density of India's road network is higher than that of Japan (0.91) and the United States (0.67), and far higher than that of China (0.46), Brazil (0.18) or Russia (0.08).[234] Qualitatively, India's roads are a mix of modern highways and narrow, unpaved roads, and are being improved.[235] As of 31 March 2015, 61.05% of Indian roads were paved.[234] India has the lowest kilometre-lane road density per 100,000 people among G-27 countries, leading to traffic congestion. It is upgrading its infrastructure. As of May 2014, India had completed over 22,600 kilometres (14,000 mi) of 4- or 6-lane highways, connecting most of its major manufacturing, commercial and cultural centres.[236] India's road infrastructure carries 60% of freight and 87% of passenger traffic.[237]

The reverse can also be expected unless the rents rise too.  This rental increase might occur if we imagine interest rates are rising because the economic environment is improving.  At present, it is widely expected that rates will rise ever so slowly over many years.  Indeed the US has been looking for the courage to do this over recent months and they may start rising there soon.
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