It used to be that you could only get truly, TRULY passive income in the paper sector -- dividends or capital gains on negotiable instruments.  Which is all well and good; I have a bit myself.  But the richest people in the world got there by building businesses.  Even Warren Buffet built a business around buying other insurance businesses.

But there's always the hassle of running the business...  maintaining the physical location and staff of employees.  Yes, if you build your business right you can have someone else run the whole thing.  But you have to have a lot of trust in your CEO, and when a human is at the wheel I still feel it prudent to check up on them once in a while.

But online business allows you to have the best of both worlds.  The business aspect provides you income that grows proportionally to the amount of value you can create times the amount of leverage you can utilize, instead of just "interest".  But the passive part of it acts more like the paper market, in that you can in many cases rely totally on the system itself and not have any employees at all!  A business where you can "set it and forget it" -- now THAT is true passive income.

And it's sweeter than honey.  =)