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Real estate and stocks are good examples of unearned income.
As I have been engaged in real estate business for about 35 years, I know much about the merits and demerits of real estate.
I can say some merits.
Firstly, the income from real estate is comparatively stable.
Therefore, it is easy to get a bank loan, which means that it is possible to get real estate with small amount of cash on hands.
But I think that the biggest merit of having real estate is a sense of fulfillment or satisfaction.