Interesting. I have to think on this
It is quite impossible to unite happiness with a yearning for what we don't have. happiness has all that it wants, and resembling the well-fed, there should not be a hunger of thirst.
I can understand this, as long as we are striving for what we really want and believe is right. By which I mean, Stoicism demands that we focus on our goals and how to get there. If my goals is financial freedom (like the FIRE movement) then being jealous of the man that has a new car is not helpful.
If that is what your goal was, then you buy a car, don't save for early retirement.