‎comparing ‎the ‎‎different types of ‎markov ‎switching ‎model for euro to iran rial‎ exchange rate

According to the law of one price, the price of a foreign commodity de-pends on its price at the origin as well as the exchange rate of that country. according to this rule, if the foreign exchange costs are in-significant, the price of a single commodity will be the same everywhere, and ideally the purchasing power of a currency inside and outside the country will be the same. due to the effect of the exchange rate on fi-nancial assets, the study of regime change in exchange rate fluctuations is importance and regime switching model is the most complete and populare regime change. the aim of this research is modeling euro-rial exchange rate under the markov regime switching and markov random regime switching models. in order to evaluate the achieved results, unit root test, which included the dickey-fuller and the phillips-peron test, is used to estimates markov regime switching and markov random regime switching parameters in order to find the best fluctuations model.