Reaction function of the size of one standard deviation shock on the current and future values of the endogenous variables shows. Ε1 and ε2 are uncorrelated if the disturbance terms, ε1 and ε2 represent sudden changes Yt ,Xt represents the sudden changes. Therefore, the response to changes in ε2 represent one standard deviation shock to the current and future values of Xt on Yt and Xt is. The overall shape of the impulse response is as follows: