Columbia subject headings:
Balance of trade--Mathematical models.
Commerce--Mathematical models.
Competition, International--Mathematical models.
Fiscal policy--Mathematical models.
Foreign exchange--Mathematical models.
Harvard subject headings:
Balance of trade--Mathematical models.
Competition, International--Mathematical models.
Fiscal policy--Mathematical models
Foreign exchange--Mathematical models
International trade--Mathematical models
Princeton subject headings:
Balance of trade--Mathematical models.
Competition, International--Mathematical models.
Fiscal policy--Mathematical models.
Foreign exchange--Mathematical models.
International trade--Mathematical models.