However, under certain circumstances, payment for personal services performed in the United States is not considered income from sources within the United States. For example, personal services performed by an independent nonresident alien contractor specifically exempted by a tax treaty. For more examples, see the Pay for Personal Service section in Publication 515, Withholding of Tax on Nonresident Aliens and Foreign Entities.
Civil aviation in India traces its beginnings to 18 February 1911, when Henri Pequet, a French aviator, carried 6,500 pieces of mail on a Humber biplane from Allahabad to Naini.[197] Later on 15 October 1932, J.R.D. Tata flew a consignment of mail from Karachi to Juhu Airport. His airline later became Air India and was the first Asian airline to cross the Atlantic Ocean as well as first Asian airline to fly jets.[198]

Jennifer Barrett, chief education officer at Acorns and editor-in-chief of Grow, agrees with Goudreau. "Developing steady passive income streams can be a great way to supplement your regular paycheck and boost your bottom line," she tells Bustle. "Just be sure to do your homework ahead of time so you're aware of the costs and risks involved and realistic about the income you can expect. Investing regularly in the stock market can provide earnings over time from compounding market returns. But there are also ways to create steady streams of passive income that pay out at regular intervals — from investing in stocks that pay dividends and bonds that pay interest to investing in a rental property or renting out your own home."

A normal distribution (bell curve) is the limit of what one would find by adding up the value of many independent quantities such as the height of people in a large group. A power law distribution is the limit of what one would find by multiplying the value of many independent quantities such as the relative size of forest fires over a large enough area and a long enough period of time.
This can be a little easier said than done, but if you have a large social media following, you can definitely earn money promoting a product or advertising for a company. You can even combine this with different marketing campaigns if you are an influencer and have your own blog (advertisement + affiliate income). This is how many bloggers make money! Again, it is not 100% passive but once set up correctly and then scaled, can be surprisingly lucrative.
If you know anything well, a place, how to fix something, how to make something, how to do something, you can write a guide for it. You can sell your guide as an e-book, offer it as a download for a fee on your site or reach out to bloggers with similar content and ask if they will offer it as a paid download on their website (for a price of course).
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.
I have several streams, which is really nice because you never know when one will dry up. I think I will be losing one of my contract optometry positions later this year. It sucks because I like the job, but it won’t be financial ruin. Even if you have a secure job, the side income does allow you to meet goals faster. I don’t think I’d ever go back to relying on one job, even if it was awesome.
India became the tenth-largest insurance market in the world in 2013, rising from 15th in 2011.[217][218] At a total market size of US$66.4 billion in 2013, it remains small compared to world's major economies, and the Indian insurance market accounts for 2% of the world's insurance business. India's life and non-life insurance industry has been growing at 20%, and double-digit growth is expected to continue through 2021.[219] The market retains about 360 million active life-insurance policies, the most in the world.[219] Of the 52 insurance companies in India, 24 are active in life-insurance business. The life-insurance industry is projected to increase at double-digit CAGR through 2019, reaching US$1 trillion annual notional values by 2021.[219]
DonebyForty Yes, that makes total sense! I hear you on the savings rate, too. I always figured I lived lean enough (and had enough saved up) that I could handle things even without my main source of income. However, after leaving my job last year and having a tough time with freelancing, I realized not having a job was more of a mental drain than a money one. I like knowing I have control and can call on another source of income and increase it when I need to. 
For a person working for a wage, their source of income is their job, or their labor (aka their time that they sell to someone). But you can own a house, and rent it out, and when your renters pay you renter every month, the source of that income check is your rental property, or your house. It would just be called rental income. If you have money in the bank in an account that pays interest, those interest payments are another source of income. We can say the source is interest payments, or we can identify the asset that is generating rent, and say your money in the bank that is generating “rent” (aka interest) is your source of income.