I was just analysing the various accounts of the balance of payments for the economy of Malaysia. It has come to my attention that the income balance and trade balance of the current account are roughly stable over the 5-year period from 2013 to 2017, i.e. there are fluctuations but they are not particularly drastic. However, the capital and financial account balances experience wild fluctuations. It can go from large negative values in the 2013-2015 period to a positive value in 2017. I would like to understand what are the reasons behind such fluctuations and if these observations can be generalised for all economies.