I think: NO. We won’t be happier if we have a better car then before or more clothes or more electronic stuff. We just feel happy during the time we’re thinking about these things but at the moment we get those things we don’t really feel as happy as we thought we’d feel. And that’s the point: people always want more and more because they think they’ll be happy if they have those thinks but as soon as they get them they aren’t.
Even scientists have shown that people who have less are happier. They appreciate thinks more than people who have everything they want. I think we should be happy with what we have and model ourself on people who appreciate the small things in life.