On bilateral flows: theoretically, if there were no statistical discrepancy,

which of the following quantities should be equal zero always? Please circle or otherwise indicate all that apply out of (1), (2) and (3) below:

1.    The US Current account

2.    The US Current Account + The Chinese Current Account

3.    The World Current Account calculated as the sum of all the Current Accounts of all Countries in the World
Please follow the convention from lecture and assume trade with space aliens equals to zero and that there are no factor payments to/from space.

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