Teburin Abubuwan Ciki
- 1. Gabatarwa
- 2. Babban Fahimta
- 3. Tsarin Tunani
- 4. Ƙarfi da Rashi
- 5. Shawarwari Masu Amfani
- 6. Cikakkun Bayanai na Fasaha da Tsarin Lissafi
- 7. Sakamakon Gwaji da Bayanin Hotuna
- 8. Misalin Tsarin Bincike
- 9. Bincike na Asali da Fahimtar Kwatanta
- 10. Aikace-aikace na Gaba da Hanyoyi
- 11. Manazarta
1. Gabatarwa
Wannan takarda ta bincika tasirin saurin canjin kuɗi akan ingantacciyar kuɗin banki da tsarin kasuwar bashi, tare da mai da hankali kan bankunan da ke da manyan haɗarin kuɗin waje (FX). Ta amfani da bayanan kwata-kwata na musamman kan sake kimanta kadarori da lamuni na kuɗin waje (Revals) daga bankunan Rasha tsakanin Q1 2004 da Q2 2020, marubutan sun nuna cewa Revals sun ƙunshi wani kaso mai mahimmanci na kuɗin banki (26.5% a matsakaita) kuma yin watsi da su yana haifar da kuskuren ƙididdigar ingantacciyar kuɗi. Binciken kuma ya bincika abubuwan da ke tattare da ingancin kasuwar bashi da kwanciyar hankalin kuɗi.
2. Babban Fahimta
Babban Fahimta: Saurin canjin kuɗi yana haifar da hanyar kuɗi ta ɓoye ta hanyar sake kimanta kuɗi wanda, idan aka yi watsi da shi, yana gurbata ma'aunin ingantacciyar kuɗin banki sosai kuma yana haifar da yanke shawara mara kyau game da tsarin kasuwar bashi. Takardar ta nuna cewa daidaitattun samfuran iyaka na stochastic suna rage ƙimar ingancin banki da kashi 30% idan ba a haɗa Revals ba, kuma wannan kuskuren ba iri ɗaya ba ne a tsakanin bankuna, yana shafar kiyaye matsayi da fahimtar manufofi.
3. Tsarin Tunani
3.1 Bayanai da Hanyoyin Bincike
Marubutan sun yi amfani da tarin bayanan panel na bankunan Rasha daga 2004-2020, gami da bayanan musamman kan sake kimanta kuɗin waje. Sun yi amfani da tsarin bincike na iyaka na stochastic (SFA) don ƙididdige ingantacciyar kuɗi, suna kwatanta samfuran tare da kuma ba tare da Revals ba. Ana amfani da copulas marasa ƙididdiga don bincika kiyaye matsayi da dogaron wutsiya.
3.2 Muhimman Sakamako
- Revals suna ɗaukar kashi 26.5% na jimlar kuɗin banki a matsakaita, tare da babban bambanci tsakanin bankuna.
- Yin watsi da Revals yana haifar da kuskuren rage ƙimar ingantacciyar kuɗi da kashi 30%.
- Kiyaye matsayi gabaɗaya ba shi da kyau sai dai a wutsiyar rarraba inganci.
- Hanyar mataki biyu ta amfani da halayen banki da ake iya gani na iya rage kuskuren da kashi biyu bisa uku.
- Revals suna haifar da ajiyar kuɗin waje na gida da rashin kwanciyar hankalin Ruble.
- Rashin yin la'akari da Revals yana haifar da ƙarshen ƙarya cewa kasuwar bashi ba ta da inganci, wanda manyan bankuna ke haifarwa.
4. Ƙarfi da Rashi
Ƙarfi: Takardar ta yi amfani da sabon tsarin bayanai mai inganci (Revals) wanda kai tsaye ya ɗauki farashin sake kimanta kuɗin waje. Gudunmawar hanyar—amfani da copulas don nazarin kiyaye matsayi—sabon abu ne kuma yana ba da zurfin fahimta game da yanayin kuskuren. Hanyar gyara mataki biyu tana da amfani kuma ana iya amfani da ita ga sauran ƙasashe masu tasowa.
Rashi: Binciken ya taƙaita ga bankunan Rasha, yana haifar da tambayoyi game da yiwuwar amfani da shi ga sauran mahallin hukumomi. Hanyar mataki biyu, duk da cewa tana rage kuskure, har yanzu tana dogara ga alamomin da ake iya gani waɗanda ƙila ba za su iya ɗaukar duk abubuwan da ke tattare da haɗarin FX ba. Takardar ba ta bincika gabaɗayan tasirin saurin canjin kuɗi a kan dogon lokaci ba.
5. Shawarwari Masu Amfani
- Ga Masu Gudanarwa: Haɗa farashin sake kimanta kuɗin waje a cikin gwajin damuwa na banki da ma'aunin inganci don guje wa rashin daidaita jarin tsari.
- Ga Manajan Banki: Yi amfani da hanyar gyara mataki biyu don samun madaidaicin maki na inganci don kimanta aikin ciki da tsare-tsare na dabaru.
- Ga Masu Zuba Jari: Daidaita samfuran ƙima don yin la'akari da farashin da ke tattare da FX na ɓoye, musamman a ƙasashe masu tasowa masu canjin kuɗi.
- Ga Masu Bincike: Yi amfani da gwajin kiyaye matsayi na tushen copula zuwa wasu mahallin inda abubuwan da ba a haɗa su ba na iya gurbata martabar inganci.
6. Cikakkun Bayanai na Fasaha da Tsarin Lissafi
6.1 Samfurin Ingantacciyar Kuɗi
An ƙayyade daidaitaccen samfurin iyaka na kuɗi na stochastic kamar haka:
$$\ln TC_{it} = \ln f(\mathbf{y}_{it}, \mathbf{w}_{it}; \boldsymbol{\beta}) + v_{it} + u_{it}$$
inda $TC_{it}$ shine jimlar kuɗi, $\mathbf{y}_{it}$ shine vector na fitarwa, $\mathbf{w}_{it}$ shine vector na farashin shigarwa, $v_{it}$ shine hayaniyar bazuwar, kuma $u_{it} \geq 0$ shine rashin ingancin kuɗi. Marubutan sun faɗaɗa wannan ta hanyar haɗa Revals a matsayin wani ɓangaren kuɗi na ƙari:
$$\ln TC_{it} = \ln f(\mathbf{y}_{it}, \mathbf{w}_{it}; \boldsymbol{\beta}) + \gamma \cdot Revals_{it} + v_{it} + u_{it}$$
Ana ƙididdige ingantacciyar kuɗi a matsayin $E[\exp(-u_{it}) | \epsilon_{it}]$, inda $\epsilon_{it} = v_{it} + u_{it}$.
6.2 Hanyar Copula don Gyara Kuskure
Don bincika kiyaye matsayi, marubutan suna amfani da copulas marasa ƙididdiga don ƙirƙirar haɗin gwiwar rarraba ƙididdigar inganci tare da kuma ba tare da Revals ba. Yawan copula $c(u,v)$ yana ɗaukar tsarin dogaro, kuma ma'aunin alaƙar matsayi (misali, Kendall's $\tau$) yana ƙididdige matakin kiyaye matsayi. Binciken ya nuna cewa kiyaye matsayi yana da girma kawai a wutsiyoyi (misali, ga mafi inganci da mafi ƙarancin ingancin bankuna), amma mara kyau a tsakiyar rarraba.
7. Sakamakon Gwaji da Bayanin Hotuna
Hoto 1: Rarraba Revals a Matsayin Kaso na Jimlar Kuɗi - Hoton histogram da ke nuna cewa Revals suna da matsakaicin kashi 26.5% na jimlar kuɗi, tare da dogon wutsiya na dama wanda ke nuna cewa wasu bankuna suna da farashin sake kimanta kuɗin waje mai yawa.
Hoto 2: Ƙididdigar Ingantacciyar Kuɗi Tare da kuma Ba tare da Revals ba - Hoton watsawa da ke kwatanta maki na inganci daga samfuran biyu. Layin digiri 45 ya nuna cewa yawancin maki suna ƙarƙashinsa, yana tabbatar da kuskuren rage ƙima lokacin da aka bar Revals.
Hoto 3: Kwandon Yawan Copula don Kiyaye Matsayi - Hotunan kwandon yawan copula da ke nuna dogaro mai ƙarfi na wutsiya amma dogaro mara ƙarfi na tsakiya, yana nuna cewa kiyaye matsayi kawai abin dogaro ne ga matakan inganci masu tsauri.
Hoto 4: Ingantacciyar Kasuwar Bashi ta Kwata na Girman Banki - Hotunan ginshiƙi da ke nuna cewa ƙarshen ƙarya na rashin ingancin kasuwar bashi yana haifar da kwata na sama na bankuna ta jimlar kadarori.
8. Misalin Tsarin Bincike
Nazarin Shari'a: Aiwatar da Gyaran Mataki Biyu ga Bankin Hasashen
Yi la'akari da banki mai halaye masu zuwa: jimlar kuɗi = $100M, Revals = $30M, fitarwa = $500M a cikin lamuni, farashin shigarwa = $10M don aiki da $5M don jari. Ta amfani da daidaitaccen samfurin SFA (yin watsi da Revals), ƙididdigar ingantacciyar kuɗi ita ce 0.65. Bayan amfani da gyaran mataki biyu ta amfani da alamomin da ake iya gani (misali, rabon ajiyar FX, saurin canjin kuɗi), ingancin da aka daidaita shine 0.82, yana rage kuskuren da kashi biyu bisa uku. Wannan gyara yana ba da damar kwatanta bankin daidai da takwarorinsa kuma yana guje wa kuskuren rarraba shi a matsayin mara inganci.
9. Bincike na Asali da Fahimtar Kwatanta
Wannan takarda ta ba da gudummawa mai mahimmanci ta hanyar haskaka hanyar kuɗi da aka manta da ita a baya a cikin nazarin ingantacciyar kuɗin banki. Gano cewa Revals sun ƙunshi sama da kashi ɗaya bisa huɗu na jimlar kuɗi abin mamaki ne kuma yana jaddada mahimmancin haɗarin kuɗi a bankunan ƙasashe masu tasowa. Amfani da copulas marasa ƙididdiga don nazarin kiyaye matsayi ya ci gaba a hanyar kuma yana ba da samfuri don bincike na gaba kan kuskuren abubuwan da ba a haɗa su ba a cikin nazarin inganci.
A kwatanta, wannan aikin ya faɗaɗa wallafe-wallafen kan ingantacciyar kuɗin banki a kasuwanni masu tasowa (misali, Berger & Humphrey, 1997; Kumbhakar & Lovell, 2000) ta hanyar haɗa wani takamaiman haɗari. Hakanan yana cika nazarin kan rashin daidaituwar kuɗi a banki (misali, Brown et al., 2018; Bruno & Shin, 2020) ta hanyar ƙididdige tasirin kuɗi kai tsaye. Hanyar gyara mataki biyu mai amfani wani muhimmin sabon abu ne wanda ke haɓaka yiwuwar amfani da sakamakon.
Daga hangen nesa na manufofi, sakamakon yana nuna cewa masu gudanarwa a ƙasashe masu tasowa ya kamata su ba da umarnin bayyana farashin sake kimanta kuɗin waje kuma su haɗa su cikin ma'aunin kulawa. Gano cewa yin watsi da Revals yana haifar da ƙarshen ƙarya game da rashin ingancin kasuwar bashi—wanda manyan bankuna ke haifarwa—yana da tasiri ga manufofin hana amana da kwanciyar hankalin kuɗi. Jaddada takardar kan rarrabuwar kawuna a kan iyaka a matsayin wani abu mai rage haɗari ya dace da shawarwari masu faɗi don gudanar da haɗari a yanayi masu canzawa.
10. Aikace-aikace na Gaba da Hanyoyi
Hanyar da aka haɓaka a cikin wannan takarda za a iya amfani da ita ga wasu ƙasashe masu tasowa masu saurin canjin kuɗi, kamar Turkiyya, Argentina, da Afirka ta Kudu. Bincike na gaba zai iya faɗaɗa binciken don haɗa tasirin kuɗin dijital da fintech akan haɗarin FX. Hanyar gyara mataki biyu za a iya daidaita ta don wasu nau'ikan farashin ɓoye (misali, farashin kiyaye muhalli a masana'antu). Bugu da ƙari, samfuran masu canzawa waɗanda ke ɗaukar yanayin saurin canjin kuɗi da ke haɓaka da mu'amalarsa da ɗaukar haɗarin banki za su kasance masu mahimmanci.
11. Manazarta
- Acharya, V. V., & Vij, S. (2021). Foreign currency borrowing and systemic risk. Journal of Financial Economics, 142(2), 601-625.
- Berger, A. N., & Humphrey, D. B. (1997). Efficiency of financial institutions: International survey and directions for future research. European Journal of Operational Research, 98(2), 175-212.
- Brown, M., Ongena, S., & Yegin, P. (2018). Foreign currency borrowing by small firms. Journal of Financial Intermediation, 33, 1-18.
- Bruno, V., & Shin, H. S. (2020). Currency depreciation and bank balance sheets. Journal of International Economics, 125, 103324.
- Kumbhakar, S. C., & Lovell, C. A. K. (2000). Stochastic Frontier Analysis. Cambridge University Press.
- Verner, E., & Gyongyosi, G. (2020). Household debt revaluation and the real economy: Evidence from a foreign currency debt crisis. American Economic Review, 110(9), 2667-2702.