Four parts of the CA:
Balance on merchandise trade
Made up of merchandise export receipts, minus merchandise import payments.
Net services
Made up of services export receipts minus service import payments. (tourism)
Net primary income
Made up of receipts of income from holding foreign assets minus payments of income to service foreign liabilities. (Interest and shares)
Net secondary income
Involves a one-way movement of money where nothing is expected in return. (Gifts)