The Economy Affected by Oil Price Shocks when that's Similar Shocks Didn't occurred in nearest recent period. In other hands, the relationship between oil price shocks and the Iran economy changed by economic structural changes. For these reasons, present study has been investigate the effects of unforeseen oil price shocks on economic growth during the period 1367.1 -1389.4 using Markov switching model. The Results show that the impact of positive unforeseen oil price shocks on economic growth

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... are lesser and more durable than negative shocks. Also they unable to ensure the high economic growth but they lead to the state of middle economic growth. In return, although negative shocks are not able to keep the economy in a state of low economic growth, but they can be prevented the economy to achieve a status of high economic growth.