I think I'm happy by nature because, by example, this year , I spend a hard time but I still feel happy.

I do not have much money also but I'm still happy. I don't have what I wish but in spite of that, I am not feeling sad . I enjoy every little thing I can get , I'm glad not to be a superficial or materialist person , I can feel happy just for the others. The most important is to have a roof and food and your family around me.     Many are unahppy and I always say to them that they still have two legs and arms .

Happiness depend on your opinion. However,if you want to be happy, you should make simple things, enjoy your life and don't compare you to other person. You will be happier 

To be happy by always be grateful for what we got

According to Angus Deaton - the Nobel prize in Economics - It's relative, the money buy the happiness depends how much money you have and what is to be happy for you... He shows that who has a good amount of money is less worried and lives better than others people that has little money, people that doesn't have enough money get worry and sad day by day. Angus Deaton cite the enough amount to be carefree and reach the happiness that is an annual income above US$ 75 mil... what do you think about?