Add Leverage (Mortgage) and you greatly increase the ROI especially from the perspective of using Rents (other peoples money) to pay down the mortgage and increase your equity in the property over time. At this point then yes price appreciation is secondary bonus and we have an arguement of how and why Real Estate can be better than Growth Stocks in some scenarios and for some investors.
The citizens of the Indus Valley Civilisation, a permanent settlement that flourished between 2800 BC and 1800 BC, practised agriculture, domesticated animals, used uniform weights and measures, made tools and weapons, and traded with other cities. Evidence of well-planned streets, a drainage system and water supply reveals their knowledge of urban planning, which included the first-known urban sanitation systems and the existence of a form of municipal government.[58]
For economic growth and almost all of the other indicators, the last 20 years [of the current form of globalization, from 1980 - 2000] have shown a very clear decline in progress as compared with the previous two decades [1960 - 1980]. For each indicator, countries were divided into five roughly equal groups, according to what level the countries had achieved by the start of the period (1960 or 1980). Among the findings:
One of the easiest ways to increase your passive income is to shift your savings to a bank that pays a higher yield on your savings — for example, Discover Bank and EverBank pay almost 1% for your money. Although it doesn’t sound like much (especially in this low interest environment), little things do add up and eventually interest rates will rise.

Love your articles. I think everyone is very different as far as how much passive income they need to meet their goals. I’ve read a lot of your articles and really enjoy your thoughts. I have a masters in finance and understand the math of keeping the debt but my emotions are such that I need to try to finish off paying off my last debt (mortgage) in the next two years. At 34 and only worth 525k I’m doing better than a lot of folks my age but it will be difficult for me to catch up in the passive income game without leverage. That is the main reason I recently created a website to try to bring passive income opportunities in my area to me.
According to financial planners and advisors, retired people could invest in Debt accrual funds for higher post-tax income. These funds are more useful to those retired people who are in the higher income tax bracket (20% and 30%). For those who are in the 10% tax bracket, and also those who do not have to pay any taxes, bank fixed deposits are equally good, they say.
For a person working for a wage, their source of income is their job, or their labor (aka their time that they sell to someone). But you can own a house, and rent it out, and when your renters pay you renter every month, the source of that income check is your rental property, or your house. It would just be called rental income. If you have money in the bank in an account that pays interest, those interest payments are another source of income. We can say the source is interest payments, or we can identify the asset that is generating rent, and say your money in the bank that is generating “rent” (aka interest) is your source of income.