if you are doing research for 100 marks then compare the data of economic survey of pakistan,State bank of pakistan,Bureau of statistics,Ministry of finance or world bank for both exchange rate and BOP.If you are doing it for m.phil then you need to consult ''google scholar'' and read atleast 10 or 15 research articles related to your topic.It is very famous topic so i presume that you are doing this for M.A.
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