1. Gabatarwa
Kasuwar canjin kuɗin waje wani muhimmin sashi ne na kowace tattalin arziki, wanda ke tasiri kai tsaye ga gasar ciniki, saka hannun jari, da kwanciyar hankalin farashin cikin gida. A Iran, wannan kasuwar tana da sauyin yanayi mai mahimmanci, musamman a farashin canjin kuɗin ba bisa doka ba na Dala na Amurka da Rial na Iran (USD/IRR). Wannan sauyin yanayi sau da yawa yana karkata daga muhimman abubuwan tattalin arziki, wanda ke nuna kasancewar kumfa na hankali na hasashe. Wannan takarda tana da nufin gano irin waɗannan kumfa a kasuwar canjin kuɗin waje ba bisa doka ba ta Iran daga 2010 zuwa 2018 ta amfani da ingantaccen tsarin lissafin tattalin arziki. Babban manufa ita ce haɓaka ingantaccen tsarin gargadi na farko wanda zai iya gano yanayin kumfa mai fashewa, waɗanda galibi suke gabatar da cikakkun rikice-rikicen kuɗi, don haka samar da ma'aikatan tsara manufofi da kayan aiki mai mahimmanci don shiga tsakani da lokaci.
2. Bita na Adabi & Tsarin Ka'idoji
2.1 Kumfa na Hankali a Kasuwannin Canjin Kuɗin Waje
Kumfa na hankali yana faruwa ne lokacin da farashin kasuwar wani kadari (kamar kuɗin waje) ya karkata bisa tsari daga ƙimarsa ta asali dangane da tsammanin masu ciniki na hankali. Masu ciniki suna ci gaba da siye a farashi mai tsada saboda suna tsammanin siyar da shi a farashi mafi girma a nan gaba, wanda ya sa kumfar ta zama annabci mai cika kanta har sai da ta fashe babu makawa.
2.2 Rashin Nasarar Tsarukan Canjin Kuɗi na Al'ada
Aikin gindi na Meese da Rogoff (1983) ya nuna cewa tsarukan tattalin arziki na yau da kullun (kamar tsarukan kuɗi) sun kasa fifita tafiya bazuwar mai sauƙi wajen hasashen farashin canjin kuɗi a waje da samfurin. Wannan "ɓacin rai na rabuwar farashin canjin kuɗi" yana nuna cewa abubuwan da suka wuce tushe—kamar yanayin kasuwa, halayen garke, da hare-haren hasashe—suna taka muhimmiyar rawa a cikin sauye-sauyen kuɗin waje na ɗan gajeren zuwa matsakaicin lokaci.
2.3 Tsarukan Markov-Switching don Gano Yanayi
Tsarukan Markov-switching, waɗanda Hamilton (1989) ya fara, sun dace musamman don nazarin jerin lokutan kuɗi waɗanda ke fuskantar sauye-sauye na hankali a cikin hali (misali, daga lokutan natsuwa zuwa lokutan sauyi). Waɗannan tsarukan suna ba da damar tsarin samar da bayanai ya canza tsakanin jihohi (yanayi) daban-daban tare da yuwuwar da za ta iya zama koyaushe ko ta sauyi da lokaci, wanda ya sa su zama masu dacewa don gano lokutan kumfa da rikici.
3. Hanyoyin Bincike & Ƙayyadaddun Tsari
3.1 Bayanai & Lokacin Samfurin
Binciken yana amfani da bayanai masu yawa akan farashin canjin kuɗin ba bisa doka ba na USD/IRR na Iran, wanda ya ƙunshi lokacin tashin hankali daga 2010 zuwa 2018. Wannan lokacin ya haɗa da muhimman abubuwan tattalin arziki kamar takunkumin ƙasa da ƙasa da girgizar farashin mai.
3.2 Tsarin Markov-Switching mai Yanayi Uku
Jigon hanyar bincike shine tsarin Markov-switching mai yanayi uku tare da yuwuwar canji mai sauyi na lokaci (TVTP-MS-AR). Yanayin uku da aka gano sune:
- Yanayi 1 (Natsuwa): Lokutan ƙaramar ƙima/rage ƙima masu bin yanayi.
- Yanayi 2 (Fashewa/Kumfa): Lokutan saurin haɓaka marar dorewa a cikin farashin canjin kuɗi (rage ƙima).
- Yanayi 3 (Rushewa): Lokutan da suka biyo bayan fashewar kumfa, galibi suna haɗa da sauyin yanayi mai yawa ko gyara.
Yuwuwar canji tsakanin waɗannan jihohin an tsara su azaman ayyuka na alamomin gargadi na farko, wanda ke ba da damar tsarin yin hasashen sauye-sauyen yanayi.
3.3 Alamomin Gargadi na Farko
Ana amfani da mahimman alamomi guda biyu don sanar da yuwuwar canji mai sauyi na lokaci:
- Ma'aunin Takunkumi: Yana ƙididdige tsananin takunkumin tattalin arziki na ƙasa da ƙasa, waɗanda ke haifar da buƙatar kuɗin waje da ba a biya ba.
- Canje-canje a cikin Ajiyar Kuɗin Waje: Yana nuna iyawa da niyyar babban bankin ƙasa na kare kuɗin.
4. Sakamakon Bincike & Bincike
4.1 Gano Lokutan Kumfa mai Fashewa
Tsarin ya yi nasarar gano yanayin kumfa mai fashewa da yawa a cikin farashin canjin kuɗin ba bisa doka ba. Muhimman lokutan sun haɗa da: 5/2011, 9-10/2011, 7/2012, 10-11/2012, 4/2013, da kuma, 1-6/2017. Lamarin na 2017 yana da mahimmanci musamman, wanda ya yi daidai da lokacin matsin lamba na tattalin arziki da tashin hankalin zamantakewa.
4.2 Yuwuwar Canjin Yanayi
Ƙididdigar yuwuwar canji mai sauyi na lokaci ta nuna cewa yuwuwar canzawa zuwa yanayi mai fashewa tana ƙaruwa da sauri lokacin da ma'aunin takunkumi ya tashi kuma ajiyar kuɗin waje ta ragu. Yanayin rushewa yakan biyo bayan lokutan fashewa, yayin da yanayin natsuwa ya yi daidai da lokutan kwanciyar hankali da shiga tsakani na manufofi.
4.3 Ayyukan Alamomin Gargadi
Tsarin ya nuna cewa alamomin gargadi na farko da aka gina suna ba da sigina da lokaci, galibi suna gabatar da farkon cikakken yanayin kumfa mai fashewa. Wannan ya tabbatar da amfanin tsarin a matsayin kayan aikin manufofi don aikin riga-kafi.
5. Fahimtar Masanin Bincike: Rarrabuwa ta Matakai Hudu
Fahimta ta Tsakiya: Wannan takarda tana ba da gaskiya mai tsanani: Kasuwar canjin kuɗin waje ta Iran ta karye gaba ɗaya, ba ta tattalin arziki ba ce ke motsa ta amma ilimin halayyar ɗan adam da siyasar ƙasa. Marubutan sun tabbatar da cewa farashin canjin kuɗin ba bisa doka ba wurin wasa ne na kumfa na hankali, inda masu ciniki, suna sane da rabuwar daga tushe, suke haifar da tashin hankali na hasashe saboda kayan aikin manufofin gwamnati suna da tsinkaya kuma ba su isa ba. Labarin ainihi ba kumfa ba ne, amma tabbatarwar tsarin Markov da sanyin lissafinsa na daidai lokacin da suka faru—wani babban laifi na manufofin mayar da martani, maimakon na riga-kafi.
Kwararar Ma'ana: Hujjar an gina ta da kyau. Ta fara ne da yarda da gazawar tsaruka na yau da kullun (Meese-Rogoff), ta karkata zuwa kuɗin halayyar ɗan adam (kumfa na hankali), sannan ta yi amfani da babban makamin ƙididdiga (TVTP Markov-switching) wanda aka tsara musamman don wannan hargitsi. Amfani da takunkumi da canje-canjen ajiya a matsayin masu motsa canji shine babban nasara, wanda ke haɗa haɗarin siyasa kai tsaye da cutar kasuwa. Ma'anar ta cika iska: girgiza na waje -> fahimtar kasuwa game da raunin babban banki -> ƙaruwar yuwuwar harin hasashe.
Ƙarfi & Kurakurai: Ƙarfinsa shine tsananin ƙwaƙƙwaran bincike da dacewar manufofi. Tsarin TVTP shine na zamani don gano yanayi, wanda ya zarce gwaje-gwajen kumfa masu sauƙi. Duk da haka, kuskure yana cikin duhun bayanan da ke cikin su. Bayanan "farashin ba bisa doka ba" daga Iran sanannen hayaniya ne kuma mai yuwuwar yin amfani da su. Duk da yake tsarin yana da ƙarfi, abubuwan da aka shigar da shi ba su da ƙarfi. Bugu da ƙari, binciken ya tsaya a gano; bai cika ƙirƙirar abin da ya faru ba—wane takamaiman aikin babban banki na ainihin lokacin (misali, ƙofar ajiya) zai iya hana kumfar 2017? Tsarin yana gano cutar amma yana jin kunya wajen ba da takamaiman adadin magani.
Fahimta mai Aiki: Ga ma'aikatan tsara manufofi, wannan ba wasa na ilimi ba ne kawai; shirin yaƙi ne. Dole ne babban bankin ya canza daga mai kashe gobara zuwa mai hasashe. Babban abin dole shi ne ƙaddamar da dashboard ɗin sa ido kan mahimman alamomin tsarin—yanayin takunkumi (watakila an zarge shi daga bayanan labarai) da matakan ajiya na ainihin lokaci. Lokacin da yuwuwar canzawa zuwa yanayi mai fashewa ta wuce wani mahimmin kofa (misali, 70%), dole ne ƙa'idodin shiga tsakani na gaba ɗaya, masu bayyana su kunna. Wannan na iya nufin sanar da jefa kuɗin waje na ɗan lokaci, mai girma ko daidaita ƙimar riba da ƙarfi. Manufar ita ce karya tsammanin hankali na fare ɗaya. Ga masu saka hannun jari, tsarin yana ba da sigina bayyananne don kare ko fita daga matsayi kafin guguwa ta afku, yana mai da gazawar manufofi zuwa riba mai zaman kanta—ƙarshe mai hankali na ƙaramin rubutu mara magana na takardar.
6. Cikakkun Bayanai na Fasaha & Tsarin Lissafi
Tsarin tsakiya shine Tsarin Markov-Switching Autoregressive (MS-AR) tare da Yuwuwar Canji mai Sauyin Lokaci (TVTP). Ana tsara tsarin farashin canjin kuɗi ${y_t}$ kamar haka:
$y_t = \mu_{s_t} + \sum_{i=1}^{p}\phi_{i, s_t} y_{t-i} + \sigma_{s_t}\epsilon_t, \quad \epsilon_t \sim N(0,1)$
inda ${s_t}$ ke nuna yanayin ɓoyayye (yanayi) a lokacin $t$, yana ɗaukar ƙima a cikin ${1,2,3}$. Babban ƙirƙira shine cewa matrix ɗin yuwuwar canji $P_t$, inda $P_{ij,t} = Pr(s_t = j | s_{t-1}=i)$, ba koyaushe ba ne amma yana bambanta da vector na alamomi $z_t$ (takunkumi, ajiya):
$P_{ij,t} = \frac{\exp(\theta_{ij,0} + \theta_{ij}' z_t)}{\sum_{k=1}^{3}\exp(\theta_{ik,0} + \theta_{ik}' z_t)}$
Wannan ƙayyadaddun yana ba da damar muhimman abubuwa da na siyasa su yi tasiri kai tsaye ga yuwuwar kasuwar shiga yanayin kumfa, wanda ya wuce gano yanayi na ƙididdiga kawai.
7. Sakamakon Gwaji & Fassarar Chati
Hoto na 1 (Ra'ayi): Yuwuwar Yanayi da aka Lallabe. Wannan chati zai nuna farashin canjin kuɗin ba bisa doka ba na USD/IRR akan lokaci, tare da bango mai inuwa dangane da yuwuwar tsarin da aka lallabe na kasancewa a kowane yanayi. Za mu ga farashin canjin kuɗi yana bin yanayi a hankali yayin lokutan "Natsuwa" na kore, sannan ya fuskanci tsinke mai kaifi, kusan a tsaye yayin lokutan "Fashewa" na ja. Waɗannan yankuna ja za su yi daidai da kwanakin da aka gano (misali, farkon 2017). Yanayin "Rushewa" (rawaya) yakan biyo bayan kololuwar fashewa, yana nuna sauyin yanayi mai yawa ba tare da bayyanannen yanayi ba. Ƙarfin chati yana cikin ganin yadda tsarin ya raba bayanan kasuwa masu hargitsi zuwa matakai daban-daban na hali.
Hoto na 2 (Ra'ayi): Yuwuwar Canji mai Sauyin Lokaci. Wannan zai iya zama panel na zane-zane da ke nuna ƙididdigar yuwuwar canzawa zuwa yanayin Fashewa daga yanayin Natsuwa akan lokaci. Za mu ga wannan yuwuwar tana tsinke da ban mamaki daidai da sanarwar sabbin takunkumi (misali, a cikin 2011-2012 da 2017) da nutsewa bayan rahotannin jefa kuɗin waje na babban banki. Wannan zanen yana nuna haɗin kai tsakanin abubuwan siyasa da rashin kwanciyar hankali na kasuwa kai tsaye.
8. Tsarin Bincike: Misali mai Amfani na Aiki
Yanayi: Masanin bincike a Babban Bankin Iran a cikin Q4 2016.
Mataki na 1 – Shigar da Bayanai: Masanin binciken yana ciyar da sabbin bayanan farashin canjin kuɗin ba bisa doka ba na yau da kullun, makin tsananin takunkumi (wanda aka samo daga nazarin labarai game da rashin tabbas na JCPOA mai zuwa), da canjin mako-mako a cikin ajiyar kuɗin waje cikin tsarin TVTP-MS-AR da aka riga aka ƙiyasta.
Mataki na 2 – Fitowar Tsari: Tsarin ya fitar da haɓaka mai kaifi a cikin yuwuwar $P_{12,t}$—damar canzawa daga Yanayin Natsuwa zuwa Yanayin Fashewa—daga 15% zuwa sama da 65% a cikin 'yan makonni.
Mataki na 3 – Fassara & Aiki: Wannan sigina ce bayyananne ta gargadi na farko. Maimakon jira farashin ya tsinke, rahoton masanin binciken ya haifar da taron manufofi na riga-kafi. Aikin da aka ba da shawarar, dangane da masu tuƙi na tsarin, zai iya zama: "Ƙara sadarwar jama'a game da isassun matakan ajiya kuma sanar da gwanjon kuɗin waje mai iyaka, mai bayyanawa don biyan buƙatar da ba a biya ba wanda alamar takunkumi ta nuna, da nufin rage $P_{12,t}$ ƙasa da 50%." Wannan tsarin yana motsa manufofi daga mayar da martani zuwa hasashe.
9. Fatan Aikace-aikace & Hanyoyin Gaba
Aikace-aikace na Nan take: Babban aikace-aikacen shi ne a matsayin kayan aikin sa ido na ainihin lokaci ga manyan bankuna da kwamitocin kwanciyar hankalin kuɗi a cikin kasuwannin masu tasowa waɗanda ke fuskantar karkatar da kasuwar canjin kuɗin waje iri ɗaya. Ana iya haɗa shi cikin dashboards ɗin sa ido kan tattalin arziki.
Hanyoyin Bincike na Gaba:
- Bayanai masu Yawa & Madadin Bayanai: Haɗa binciken yanayi daga kafofin watsa labarun zamantakewa da ciyarwar labarai don inganta alamar takunkumi/haɗarin siyasa a ainihin lokaci.
- Binciken Ƙasashe da Yawa: Yin amfani da tsarin iri ɗaya ga wasu tattalin arzikin da aka takunkunta ko masu saurin rikici (misali, Venezuela, Turkiyya) don gwada gama gari da gano abubuwan da suka haifar da gama gari.
- Module na Kwaikwayon Manufofi: Ƙara tsarin don haɗa aikin mayar da martani na babban banki, yana ba shi damar kwaikwayon martanin kasuwa ga dabarun shiga tsakani daban-daban (misali, haɓaka ƙimar riba da siyar da kuɗin waje kai tsaye) da gano manufofin da suka fi dacewa na rage kumfa.
- Haɗin kai na Koyon Injina: Haɗa ƙarfin tsarin Markov tare da ikon gane tsarin na LSTM ko tsarukan Haɓaka Gradient don ƙara inganta daidaiton gargadi na farko.
10. Nassoshi
- Hamilton, J. D. (1989). Sabuwar hanya ga nazarin tattalin arziki na jerin lokutan da ba su tsaya ba da kuma tsarin kasuwanci. Econometrica, 57(2), 357-384.
- Meese, R. A., & Rogoff, K. (1983). Tsarukan farashin canjin kuɗi na shekarun saba'in: Shin sun dace da waje da samfurin? Journal of International Economics, 14(1-2), 3-24.
- Phillips, P. C., Shi, S., & Yu, J. (2015). Gwaji don kumfa da yawa: Lamuran tarihi na farin ciki da rugujewa a cikin S&P 500. International Economic Review, 56(4), 1043-1078. (Don hanyar gwajin kumfa).
- Filardo, A. J. (1994). Matakan tsarin kasuwanci da motsin su na canji. Journal of Business & Economic Statistics, 12(3), 299-308. (Akan yuwuwar canji mai sauyi na lokaci).
- Asusun Ba da Lamuni na Duniya. (2020). Rahoton Shekara-shekara kan Tsare-tsaren Canjin Kuɗi da Ƙuntatawa (AREAER). (Don mahallin tsarin canjin kuɗin Iran).