When a student in 1994-1998 I had a friend whose parents own a business kos-kos’s. Do not know exactly how much room in a boarding house, lodging house, but it seems kos-kosan pretty good at governance. Most who live there are students UPH (Universitas Pelita Harapan) and it seems there are some young employee. I do not know exactly what their job, which I know they only have a business of kos-kos. And my knowledge, this family includes the well-off families in our neighborhood.
Now I just realized, that they are investing property for the purpose of Cash Flow. Every month they will get money from the lease of the kos-kos. Just imagine if the house there are 10 rooms (at that time I remember her level and in the back is big enough), and each room pay Rp 500,000, – only. So in a month would generate USD. 5 million net of operating expenses such as Rp 500,000, – then the net income is Rp. 4.5 million dollars. Now this is called the Cash Flow. Every month they will receive USD 4.5 million dollars, a year to Rp 54 million rupiah. Usually the price will continue to rise and mean income will also rise each year, for example, from Rp 500,000, – per room to Rp 1 million per room in a few years, then any income will also rise.