In the balance of payments, capital inflow and outflow refers to 3 main components:
1) People migrating into or out of Australia
2) Foreign aid, usually infrastructure (eg. building roads in Ethiopia)
3) Purchase or sale of Non-financial assets, intellectual property such as patents and copyrights and franchises.
Capital INFLOW, or credits: people migrating into Aus, Aus receiving foreign aid, or Australians selling Meat Pie copyrights to Americans.
Capital OUTFLOW, or debits: people migrating out of Aus, Australia giving out foreign aid, or purchasing of those non-financial assets.
In 2002-03, the capital account in the BoP had a surplus of $1.3bn, meaning more capital is flowing into Australia than out.