Are the subjects related to economics good for UPSC mains exam? How deeply will UPSC asks questions in this particular paper?

Are the subjects related to economics good for UPSC mains exam? How deeply will UPSC asks questions in this particular paper?
thank u

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Dear,
It is not the matter of deep or light questions. But it is the matter that how much can you give your best to that subjects. So I think if you choose the subjects in which you are interested a lot and in which you are much more convenient. Because your can convenient or interested subject can give you the zeal and hope to appear the examination. I think you can understand me. Thanks...