As you say, in today's world where everyone is fighting for money, yes this is a true fact. We all know that none of our needs can be met without money. In today's world money has become an important part of our life, that you can't live without it. But it is equally true that money cannot buy happiness.
Such as,
1) you can't buy a relationship with money - we know that relationship is the most wonderful gift god has given to us. In order to maintain a relationship, we need feelings, respect as well as care for each other.
2) money cannot buy time -Elapsed time never came back and you cant even buy it with money.
3) money cannot fix broken relationship - Just as money can't buy a relationship also we can't repair a broken relationship with money .
4) you can't even buy your health with money - No matter how much money you spend, you can't get your health back.