Opportunity cost is the basic concept at the heart of residual income. Opportunity cost refers to what you are giving up to use an asset for a particular project or investment. Let's say you start with $100,000 cash in your stock portfolio and grew that money to $104,000 by spending only a few hours per month trading stocks. Now $4,000 in profit may look just fine when you consider that you only worked, say, 20 hours for it in total. However, once you consider your opportunity cost, your little hobby will not look nearly as profitable. If banks are paying six percent for risk-free certificates of deposit, your $100,000 would have grown to $106,000 simply by depositing it in a bank. Your opportunity cost is $6,000

Unfortunately, I can’t answer that conclusively one way or the other. It all depends on you, what you like to do, your work ethic, personality, etc. If you are a good writer perhaps you could write a book and make money that way. Or, you could start your own website and do affiliate marketing. Just because you are young it doesn’t mean you can’t make money doing at least a few of these ideas. I wish you luck in your money making efforts!
Department C has earned $142.5 million residual income as compared to $40 million earned by department P. Residual income allows us to compare the dollar amount of residual income earned by different departments. Since the residual income in both cases is positive, we conclude that both have met the minimum return requirements. However, with residual income is not easy to compare performance.

Investing in rental properties is an effective way to earn passive income. But it often requires more work than people expect. If you don’t take the time to learn how to make it a profitable venture, you could lose your investment and then some, says John H. Graves, an Accredited Investment Fiduciary (AIF) in the Los Angeles area and author of “The 7% Solution: You Can Afford a Comfortable Retirement.”
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Of course, there are large fast-food, pet store, and other enterprises that cost a great deal. However, consider a DVD rental machine, soda, or gum ball machines as more passive avenues to income. These require little maintenance, coins, bills, or revenue collected via credit cards, as well as periodic refilling of machines.  These machines are, perhaps, one of the more lucrative paths to a passive income with little input from you.
Who cares, especially when very conservatively, the ultimate passive income includes a six digit or more base lease, plus an estimated additional six digits or more for rate increases and another six digits for more for various smaller and one bigger technology increase at 25 years. All four (base, rate, smaller and mega technology increases) combined, certainly could yield much more depending upon inflation, rate increases and technology increases?
1. In-post reviews and recommendations: This is often the first passive income opportunity that comes to mind. You write a review about a product or service you love and hope your readers decide they need that too. You probably have the opportunity to recommend at least one relevant product within most of your posts. For example, when you are sharing your favorite pressure cooker dinner recipe you can also include an affiliate link to the pressure cooker you use.

I prefer assets that make me a high return for the lowest amount of work possible (semi-passive involvement). And assets that pay me in several unique ways. Cash flow is only one way RE makes money for me. I also get principal reductions, appreciation, tax advantages (depreciation), and I control the rental increases on a yearly basis. Plus a majority of the capital is provided by the secondary market on 30 year fixed low interest rate debt.


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Residual income can have two different definitions or applications. The first definition, a less common application of residual income, is the money that is left after monthly debts are paid. This calculation is particularly important when a person is seeking financing or a loan based on their income and available money to cover the additional debt. In this scenario, the residual income is calculated by this formula:
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