How much extra money do one person need to be happy?

with $500 per month from online income, i'd be quite happy :)

It depends on ones self satisfaction. It even depends on how good one feels about his/her income. If one is earning a lot from regular money, he/she might be less interested in looking for extra money. for me I prefer 500$ is what I will be happy. But its quite a long way from now to go on..Till then cheers and keep posting. have a nice day!

I think human being will never be happy. Once they earn $10, they like to have $100, and once they get $100, they will looking for 1000.... This is never ending story

If my jobs cover the running expenses of my life then that's ok that far. Then I would be happy when I have enough extra money to book a flight to USA with a bit left over to spend there. That's what I'm saving up my online dollars for - to go and see my sister

Hmmmm...that's a tough question! I guess it would depend on what ya wanna do with the extra money, and also what a person's view of "extra" is...for some, "extra" is a few hundred a month, for others it could be a few thousand, maybe even more....For me, I'm happy making an extra $500/month online :)