Audiobooks are witnessing a surge in popularity when compared to their text-based counterparts. If you have decided to write and publish an eBook, converting it into an audiobook requires little effort and is a great way to bolster your income. Amazon's Audible ACX platform connects authors with producers who can turn their written work into professional grade audio. Once that's done, the audiobooks are put up for sale on Audible and iTunes.
In 2011, the Indian government concluded that most spending fails to reach its intended recipients, as the large and inefficient bureaucracy consumes budgets.[381] India's absence rates are among the worst in the world; one study found that 25% of public sector teachers and 40% of government-owned public-sector medical workers could not be found at the workplace.[382][383] Similarly, there are many issues facing Indian scientists, with demands for transparency, a meritocratic system, and an overhaul of the bureaucratic agencies that oversee science and technology.[384]
We live in an exciting time. You can literally make money while you sleep. As an entrepreneur, you don’t get a steady paycheck. You can create financial stability when you create multiple streams of income and make some of them passive. Use these steps and tools. Don’t just run towards the online because these are still a lot of opportunities offline. Create systems and don’t try to do it all alone.

The other point is that it is pretty easy to get started.  You don’t need to be super rich, and you don’t need a lot of time to get started.  To say it requires no time would be a lie, but you don’t need to make anything listed above your life.  You can work at your job, invest your excess income, save to buy a rental property or rent out a room in your current house, and you start a side job online without breaking a sweat.
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!
It is our duty now to begin to lay the plans and determine the strategy for the winning of a lasting peace and the establishment of an American standard of living higher than ever before known. We cannot be content, no matter how high that general standard of living may be, if some fraction of our people—whether it be one-third or one-fifth or one-tenth—is ill-fed, ill-clothed, ill-housed, and insecure.
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.