One good thing to make passive income is by selling Reports about something , gather lots of useful data and sell it as pdf. If you can put some graphs, charts

One good thing to make passive income is by selling Reports about something , gather lots of useful data and sell it as pdf. If you can put some graphs, charts ,or infographic in it to make it more insightful. Here is great example : http://www.marketinghotsheet.com/ http://www.marketinghotsheet.com/ One of my friend used to do it, he had made good mullah through it.