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Exogenous variable

A variable which, although playing an important part in a model, is determined by forces outside the mode! and is unexplained by it. For example, in a mode! of the market for wheat, weather conditions may play an important part in determining the supply and hence the price of wheat. But the mode! itself does not try to explain what determines weather conditions.

Reference: The Penguin Dictionary of Economics, 3rd edt.