The doctor or lawyer, for instance, could use her or his income to invest in a medical start-up or buy shares of medical companies he understands such as Johnson & Johnson. Over time, the nature of compounding, dollar cost averaging, and reinvesting dividends can result in her or his portfolio generating substantial passive income. The downside is that it can take decades to achieve enough to truly improve your standard of living. However, it is still the surest path to wealth based on the historical performance of business ownership and stocks.
That's odd, because lot of these questions are actually pretty easy to answer. The IRS is good about publishing the data. Given that – and given the recent interest in personal income inequality, I decided to write a little bit about the different kinds of income people report on their tax returns. A longer paper – Sources of Personal Income – is here, but for a brief overview, you might want to check out the top ten sources of income:
Finally, I imagine the biggest debate with my ranking is Creating Your Own Product as the #1 passive income source. If most people have never created their own product, then it’s easy to give it a thumbs down. There won’t be much complaint about Private Equity Investing being in last place because most people are not accredited investors. But given I believe that plenty of people can create their own product if they try, pushback is inevitable because a lot of people simply don’t try!
Child labour in India is a complex problem that is rooted in poverty. Since the 1990s, the government has implemented a variety of programs to eliminate child labour. These have included setting up schools, launching free school lunch programs, creating special investigation cells, etc.[360][361] Author Sonalde Desai stated that recent studies on child labour in India have found some pockets of industries in which children are employed, but overall, relatively few Indian children are employed. Child labour below the age of 10 is now rare. In the 10–14 age group, the latest surveys find only 2% of children working for wage, while another 9% work within their home or rural farms assisting their parents in times of high work demand such as sowing and harvesting of crops.[362]
Buy a small business: A local small business, like a car wash or a laundromat, is a great way to put money down on a money-making venture. Automate it so you don't have to be on the premises unless you're collecting money. Go into a local business with your eyes wide open - study the books, especially on income and expenses, and examine water and utility bills if your venture will be open 24 hours.

"The whole idea of Multiple Streams of Income will be a powerfulparadigm shift for most people. Bob Allen gives practical andbeautifully illustrated knowledge on how to do it. Masteringfinancial principles is an important habit in life because it givesus the freedom to focus on what matters most. A valuable read."—Dr. Stephen R. Covey, author of The 7 Habits of HighlyEffective People

Lending Club is a platform where you can lend your money to other people. You’re the bank. Each note is only $25, so you can invest $1,000 and lend money to 40 people. There are many grades of loan (from safest to riskiest) and investors earn, on average, between 5% and 7% annualized returns. For more information, check out Investing and Making Money with Lending Club Peer-to-Peer Lending and my real money Lending Club Portfolio.

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.