تاثیر تلاطم‌های ارزی در اثرگذاری سیاست‌های پولی بر تراز تجاری غیرنفتی ایران با تاکید بر تغییرات رژیمی

در این مطالعه نقش تلاطم های ارزی در تاثیر گذاری سیاست های پولی بر تراز تجاری غیر نفتی ایران با تاکید بر تغییرات رژیمی طی دوره زمانی 1352-139٦ به صورت فصلی بررسی شده است. در این راستا از رگرسیون egarch برای مدل سازی تلاطم های ارزی و از رگرسیون star برای بررسی نقش این تلاطم ها در تاثیر گذاری سیاست پولی بر تراز تجاری غیرنفتی استفاده شده است. نتایج مربوط برآورد مدل star نشان داد که دو رژیم شامل رژیم بالا و پایین با مقدار آستانه -٤/055- برای متغیر تراز تجاری در دوره زمانی مورد . مطالعه وجود دارد. نتایج مربوط به رژیم پایین تراز تجاری کمتر از ٤/055- نشان میدهد که متغیرهای تراز تجاری با یک وقفه نرخ ارز ،حقیقی شاخص تلاطم ارزی با سیاست ،پولی نقدینگی و شاخص باز بودن تجاری به ترتیب به میزان 13/980، 1/299- ، ٠/٤٦٢-١/٤٠٤ و 2/٤٨٤ - برتراز تجاری تاثیر دارند. در رژیم بالا تراز تجاری بیشتر از 4/055) نیز متغیرهای تراز تجاری با یک وقفه نرخ ارز ،حقیقی شاخص تلاطم ارزی با سیاست ،پولی، نقدینگی و شاخص باز بودن تجاری به ترتیب به میزان ،25/601 ، ،1/٦٠٤، 10/562، 2/177 و 3/158 بر تراز تجاری تاثیر دارند. بنابراین در رژیم پایین تلاطم نرخ ارز بر تراز تجاری تاثیر منفی و در رژیم بالا تاثیر مثبت دارد این نتیجه میتواند به علت تلاطمهای شدید نرخ ارز در دوران پس از انقلاب باشد که به دلیل کاهش ارزش پول ملی، سبب ارزان شدن کالاهای داخلی نسبت به کالاهای خارجی و افزایش صادرات غیر نفتی شده است.

the impact of currency fluctuations on the effect of monetary policies on iran’s non-oil trade balance with an emphasis on regime changes

extended abstractintroductionone of the most important challenges of iran’s economy in recent decades is its excessive reliance on oil revenues. according to the time series of the central bank, during the years after the islamic revolution and especially the years after the imposed war, on average 80 to 90 percent of the export income, 40 to 50 percent of the government’s annual budget and 20 percent of the country’s total gross domestic product it is provided from the place of oil export. based on this, the development of the export of non-oil products with a relative advantage in the world markets is considered an inevitable requirement for the country of iran. in other words, due to the strong dependence of the country’s economy on oil on the one hand and the instability and extreme fluctuations of oil prices in the world markets, as well as due to the dominance of a multilateral monopoly market on it on the other hand, many anomalies that rule this market it is transferred inside and causes economic activities to fluctuate according to the exchange rate (maghdisi and ali-shahi, 2016). according to economic planners and policy makers; the only way to free the country from the single-product economy and dependence on foreign exchange income from the sale of oil, as well as to meet the country’s ever-increasing foreign exchange needs, is to develop non-oil exports and access global markets. if the foreign currency demand for imports is met from the foreign exchange earnings of non-oil exports, the country’s economy will not need oil export earnings and the direct injection of these oil foreign exchange resources into the domestic economy in the current form. for this reason, the economic policy makers in iran have paid special attention to the improvement of the non-oil trade balance in the medium-term (economic and social development programs) and long-term (perspective document of iran 1404) programs of the country and mainly emphasized on the monetary and banking sector has been supported by granting facilities with lower interest than non-oil producers and exporters.due to the importance of this issue, in this study, the role of currency fluctuations in the impact of monetary policies on iran’s non-oil trade balance has been analyzed seasonally, with an emphasis on regime changes during the period of 1352-1396. in this regard, egarch regression has been used to model currency fluctuations and star regression has been used to investigate the role of these fluctuations in the impact of monetary policy on the non-oil trade balance.methodology following the empirical studies, the following model has been considered to achieve the goals of this study:                                    (1)where in,lxtmt: natural logarithm of the ratio of non-oil exports to total imports in year t;lrexcht: the natural logarithm of the real exchange rate (the product of the free market exchange rate by the global producer price index divided by the producer price index in iran) in year t;vrexcht: currency volatility index (conditional variance of variable lrexch_t) in year t;lmtgdpt: the natural logarithm of the ratio of total liquidity to iran’s nominal gdp in year t;vrexch*lmtgdpt: the natural logarithm of the ratio of total liquidity to iran’s nominal gdp in the currency volatility indexloilxt: natural logarithm of revenues from oil and gas exports in million dollars in year t;lopenesst: natural logarithm of trade openness index (ratio of total trade to nominal gdp) in year t;εt: is the residual of the model in year t.after estimating exchange rate fluctuations by egarch regression in the period of 1352-1996 on a seasonal basis, the star model was used to investigate the role of exchange rate fluctuations in the impact of monetary policies on iran’s non-oil trade balance, emphasizing regime changes in the period. the study is estimated. also, all the data were obtained from the database of the central bank of the islamic republic of iran and the world bank. findings the results of star model estimation showed that there are two regimes including high and low regime with a threshold value of -4.055 for the trade balance variable in the studied time period. the results related to the low regime (trade balance less than -4.055) show that the variables of trade balance with one break, real exchange rate, currency volatility index with monetary policy, liquidity and trade openness index are respectively 980/ 13, -1.299, -0.462, -1.404 and -2.484 have an effect on the trade balance. in the above regime (trade balance more than 4.055), variables of trade balance with one break, real exchange rate, currency volatility index with monetary policy, liquidity and trade openness index are 25.601, 1.604, 562 respectively. 0.0, 2.177 and 3.158 have an effect on the trade balance. therefore, in the low regime, the exchange rate fluctuation has a negative effect on the trade balance, and in the low regime, it has a positive effect. this result can be due to the severe exchange rate fluctuations in the post-revolution period, which caused domestic goods to become cheaper compared to foreign goods and increased non-oil exports due to the decrease in the value of the national currency. although the increase in non-oil exports in the country is mainly in the form of raw materials and agricultural products, and industrial products have a very small share in the country’s exports. the dependent variable coefficient with one break in both regimes has a positive effect on the trade balance in the current period, which is consistent with empirical studies. other variables have negative coefficients in the low regime and positive coefficients in the high regime, which shows that the real exchange rate, liquidity and trade openness had a negative effect on the trade balance in the period before and at the beginning of the revolution until the fourth quarter of 2012. but after 2012, the mentioned variables have had a positive effect on the trade balance. the reason for this can be due to the decreasing trend of the trade balance during the period of the low regime, which could not have a positive role on the trade balance due to the excess of imports and the lack of non-oil exports, the variable of trade openness, as well as the exchange rate and liquidity. but in the above regime, which lasts from the first quarter of 2013 to the fourth quarter of 2016, the trend of the trade balance is increasing in these years. therefore, the aforementioned factors have also played a positive role in increasing the trade balance, although as it was said, most of the country’s non-oil exports are from the raw materials of industrial production and agricultural products, and it cannot be said that the improvement of the trade balance during the high regime period is due to it has been an increase in the export of industrial products. the results obtained from this research are consistent with the results of the studies of wong and chong (2016), gomez and alvarez (2006). also, the results of the research of agbola (2005) and gilfason and risagar (1984) are in accordance with the results of this study in the low regime. from the point of view of the effect of liquidity on the trade balance, the results obtained are consistent with the research of fitras et al. (2014). conclusionthe results of star model estimation showed that there are two regimes including high and low regime with a threshold value of -4.055 for the trade balance variable in the studied time period. the results related to the low regime (trade balance less than -4.055) show that the variables of trade balance with one break, real exchange rate, currency volatility index with monetary policy, liquidity and trade openness index are respectively 980/ 13, -1.299, -0.462,