When you gain wealth, you also lose something. When you are rich, you look happy, but in fact you are very empty inside. Therefore, wealth can only be used to embellish our lives. Don't cling to money, we can always be happy.
Definitely there is no basis that money makes someone unhappy infact in todays trend there are lot of people unhappy because of having no money thinking they can't fullfill the basic needs. Happiness is all depends on how we deal with life.