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In finance, a synthetic position is a way to create the payoff of a financial instrument using other financial instruments.
A synthetic position can be created by buying or selling the underlying financial instruments and/or derivatives.
If several instruments which have the same payoff as investing in a share are bought, there is a synthetic underlying position. In a similar way, a synthetic option position can be created.
For example, a position which is long a 60-strike call and short a 60-strike put will always result in purchasing the underlying asset for 60 at exercise or expiration. If the underlying asset is above 60, the call is in the money and will be exercised; if the underlying asset is below 60 then the short put position will be assigned, resulting in a purchase of the underlying at 60.