There is a study that shows that it is difficult to be happy when one is very poor, and that happiness grows with wealth. But only up to a certain threshold. When you are too rich, the curve of the simplicity begins to fall.
This shows how Epicurus was right.
Sorry I'm a bit of a run and I can't find a link to what I mentioned now.
However, I believe that it is very important and interesting to discuss what is natural and necessary for us.