This is the international icon of happiness. And there are many books on this topic in order to measure it or to determine whether money makes happiness.
One of these books is written by the English economist Richard Layard, "Happiness", where he shows that the inhabitants of developed countries are not happier when they earn more money and they can buy more food, clothes and material objects.
What do you think? Are you happier when you have more money and then you can buy more material objects?