How do you take care of a money tree?

We bought a money tree a few months ago. However, for some reason many of the leaves turn yellow and droop down. I would like to know how to prevent this from happening. Does it need more sunlight? Less water? Plant food? Is it natural for this to happen?

I have a question about this question... Is this a metaphorical question ? If its not check the climate most erotic or even domstice trees need certain living conditions until ther are big and strong.