نوع مقاله : پژوهشی
نویسندگان
1 دانشگاه مازندران
2 مازندران
چکیده
به طور کلی، کشف صحیح حبابهای قیمتی داراییها به دلیل نااطمینانی در شناسایی دقیق عوامل بنیادین و تصادفی بودن آنها پیچیده و دشوار است. به ویژه، اگر حباب‌ها ذاتی بوده و به بنیادها وابسته باشند، تصریح صحیح معادله حباب دشوارتر میشود. بسیاری از روشهایی که تاکنون جهت آزمون حبابهای قیمتی به کار گرفته شدهاند، به دلایل مختلفی مورد انتقاد قرار گرفتهاند. در این راستا، مطالعه حاضر با تشکیل یک الگوی فضای حالت غیرخطی از تکنیک فیلتر کالمن نقطه سیگما (SPKF) برای اندازه‌گیری حبابهای قیمتی در بازار ارز غیررسمی ایران در بازه زمانی 1394:06-1381:01 استفاده کرده است. نتایج نشان میدهد که بخش قابل توجهی از تغییرات نرخ ارز در این دوره زمانی، به خصوص در دهه 1390، به دلیل تشکیل حبابهای قیمتی بوده است. در این چارچوب، بیشترین سهم حباب‌ها در تغییرات نرخ ارز نیز مربوط به ماه مهر سال 1391 بوده است، به طوریکه حدود 61 درصد از افزایش نرخ ارز در این ماه در مقایسه با ماه قبل به حباب قیمتی نسبت داده شده است. به علاوه، در سال 1394، حبابهای نرخ ارز بسیار ناچیز و ارزش بازاری نرخ ارز نزدیک به ارزش بنیادی آن بوده است.
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