Establishing residual income allows you to accumulate wealth faster, have a more flexible lifestyle and maintain a diverse financial portfolio. As with any successful investment, hard work is required. With residual income, however, that work tends to be upfront. Once your revenue stream is established, the work and time involved is significantly lower than active income sources. With residual income, you’ll secure funds for your future, have a better idea of where you stand financially and enjoy peace of mind knowing you’re maintaining lucrative, long-term investments.  
The authors found that those born to parents in the bottom 20 percent of earners (measured by permanent income, or the average labor market earnings over people’s working lives) had a 39 percent chance of remaining in the bottom 20 percent. Those born in the bottom 20 percent of the wealth distribution had a 27 percent chance of staying there. On the other end of the spectrum, those born in the top 20 percent of permanent income and wealth distributions had a 41 and 47 percent chance of staying there, respectively. (Figures showing these transitions are available in The Regional Economist article “Which Persists More from Generation to Generation—Income or Wealth?”)
Generating passive income does NOT happen overnight. I don’t live, teach, or believe in get-rich-quick schemes. My first online business took about a year of hard work before it was generating enough income to support my family. There was nothing easy about what I had to do to get that business going. But in relative terms, it was “quick” because I decided to opt-out of the work-till-sixty-five-deferred-life plan and make my own luck happen. You can do it too.

This is an important concept in personal finance because banks typically use this calculation to measure the affordability of a loan. In other words, does Jim make enough money to pay his existing bills and an additional loan payment? If Jim’s RI is high, his loan application will have a greater chance of being approved. If his RI is low, he will probably get rejected for the loan immediately.

1. The batting cage idea is very risky. I’ve seen many of them close over the years and it is not anything close to passive income if you want to keep the business going. You have to continually promote it and target youth leagues, coaches, schools etc to catch all of the new players who grow up and want to play. I’ve played at probably 8 batting cages over the years and 7 of them closed.
Here's another example. If a person owns apartments that are rented out at a profit, they earn money each month without working a specific number of hours. If the owner earns $100/month net income from each apartment, the determining factor is how many apartments they own, not how many hours they work. Therefore, they may own 1 apartment and make $100 net income each month, or they could own 500 apartments and make $50,000 ($100 per apartment) each month.
As an economic concept, residual income has a long history, dating back to Alfred Marshall in the late 1800s.1 As far back as the 1920s, General Motors used the concept in evaluating business segments.2 More recently, residual income has received renewed attention and interest, sometimes under names such as economic profit, abnormal earnings, or economic value added. Although residual income concepts have been used in a variety of contexts, including the measurement of internal corporate performance, this reading will focus on the residual income model for estimating the intrinsic value of common stock. Among the questions we will study to help us apply residual income models are the following:
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Managerial accountants define residual income as the amount of operating revenues left over from a department or investment center after the cost of capital used to generate the revenues have been paid. In other words, it’s the net operating income of a department or investment center. You can also think of it as the amount that a department’s profits exceed its minimum required return.
In equity valuation, residual income represents an economic earnings stream and valuation method for estimating the intrinsic value of a company's common stock. The residual income valuation model values a company as the sum of book value and the present value of expected future residual income. Residual income attempts to measure economic profit, which is the profit remaining after the deduction of opportunity costs for all sources of capital.