One absolute valuation method which may not be so familiar to most, but is widely used by analysts is the residual income method. In this article, we will introduce you to the underlying basics behind the residual income model and how it can be used to place an absolute value on a firm. (The DDM is one of the most foundational of financial theories, but it's only as good as its assumptions. Check out Digging Into The Dividend Discount Model.)
For those who prefer a more do-it-yourself style but still want their investments to be managed automatically, a robo-advisor like Betterment may be better suited. After completing an initial questionnaire, this program will automatically invest your money based on things like your risk tolerance and time horizon. They’ll even rebalance your portfolio when necessary – all automatically, of course!
The biggest surprise is real estate being second to last on my Passive Income Ranking List because I’ve written that real estate is my favorite investment class to build wealth. Physical real estate doesn’t stack up well against the other passive income sources due to the lack of liquidity and constant maintenance of tenants and property. The returns can be huge due to rising rental income AND principal over time, much like dividend investing. If you are a “proactive passive income earner” like myself, then real estate is great.

Residual income is the amount of net income generated in excess of the minimum rate of return. Residual income concepts have been used in a number of contexts, including as a measurement of internal corporate performance whereby a company's management team evaluates the return generated relative to the company's minimum required return. Alternatively, in personal finance, residual income is the level of income that an individual has after the deduction of all personal debts and expenses have been paid.