Airbnb is a concept that has only been around for a few years, but it has exploded around the globe. Airbnb allows people to travel all around the world and to stay in accommodations that are a lot less expensive than traditional hotels. They do this by staying with participating Airbnb members who rent out part of their homes to travelers. By participating in Airbnb, you can use your residence to accommodate guests and earn extra money just for renting out space in your home.

Example of Compound Interest: You invest $1000 as an initial deposit into an account that pays a 6% interest rate (slightly lower than the average of the stock market), and then you deposit $300/month (About 10% of $50k/year salary). After 10 years you would have $50k, then $141k after 20 years and $307k after 30 years. And this is even without increasing your savings relative to your rising salary!

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.
From what he describes, creating passive income definitely does not sound easy. It requires a serious ramp-up -- often requires 80- to 100-hour workweeks in the beginning, says Flynn. But once up and running, and depending on the content, some sites take fairly minimal maintenance. Green Exam Academy, the LEED exam study site he launched in 2008, takes just him four to five hours a month to maintain but brings in $250,000 annually.
This idea has already gained a lot of popularity. Both type of people who have less content (such as DIY projects) or have a lot of content (comedy, education, tutorials) and others who fall in between can create a successful YouTube channel by posting interesting videos regularly. You may decide to shoot or use computer graphics to communicate your message. This can be a handsome source of passive income.
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.