ASYMMETRIC EXCHANGE RATE PASS-THROUGH TO INFLATION IN SIERRA LEONE: EVIDENCE FROM A NONLINEAR ARDL MODEL

Abu Bakarr Tarawalie, Madine Rodliz Dingie

Abstract


This article examines asymmetric exchange-rate pass-through to inflation in Sierra Leone using annual data for 1980–2024 and a Nonlinear Autoregressive Distributed Lag model (NARDL). The analysis separates depreciation from appreciation in order to test whether exchange rate losses and gains transmit differently to domestic prices, while controlling for money supply, petroleum import prices and real GDP. Unit-root results show a combination of I(0) and I(1) variables, supporting the NARDL approach, and the bounds test confirms a long-run relationship among the variables. The long-run estimates indicate that money supply and petroleum import prices are the main determinants of inflation, whereas the long-run asymmetric exchange rate effects are not statistically significant. In the short run, depreciation raises inflation more strongly than appreciation reduces it, and this asymmetric response is supported by the Wald test and dynamic multiplier evidence. The findings suggest that inflation control in Sierra Leone requires exchange rate stability, prudent liquidity management, lower exposure to imported fuel and stronger domestic production capacity.

 

JEL: E31; F31; F41; C32; O55


Keywords


exchange rate pass-through; inflation; asymmetry; NARDL; Sierra Leone; monetary policy

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References


Amoah, L., & Aziakpono, M. J. (2018). Exchange rate pass-through to consumer prices in Ghana: Is there asymmetry? International Journal of Emerging Markets, 13(1), 162–184. https://doi.org/10.1108/IJoEM-07-2016-0179

Aron, J., MacDonald, R., & Muellbauer, J. (2014). Exchange rate pass-through in developing and emerging markets: A survey of conceptual, methodological and policy issues, and selected empirical findings. The Journal of Development Studies, 50(1), 101–143. https://doi.org/10.1080/00220388.2013.847180

Bangura, M., Caulker, E., & Pessima, S. (2012). Exchange rate pass-through to inflation in Sierra Leone: A structural VAR approach. Bank of Sierra Leone Working Paper. Retrieved from https://www.researchgate.net/publication/350948770_EXCHANGE_RATE_PASS-THROUGH_TO_INFLATION_IN_SIERRA_LEONE_A_STRUCTURAL_VECTOR_AUTOREGRESSIVE_APPROACH

Bussière, M. (2013). Exchange rate pass-through to trade prices: The role of nonlinearities and asymmetries. Oxford Bulletin of Economics and Statistics, 75(5), 731–758. https://doi.org/10.1111/j.1468-0084.2012.00711.x

Campa, J. M., & Goldberg, L. S. (2005). Exchange rate pass-through into import prices. The Review of Economics and Statistics, 87(4), 679–690. https://doi.org/10.1162/003465305775098189

Choudhri, E. U., & Hakura, D. S. (2006). Exchange rate pass-through to domestic prices: Does the inflationary environment matter? Journal of International Money and Finance, 25(4), 614–639. https://doi.org/10.1016/j.jimonfin.2005.11.009

Delatte, A.-L., & López-Villavicencio, A. (2012). Asymmetric exchange rate pass-through: Evidence from major countries. Journal of Macroeconomics, 34(3), 833–844. https://doi.org/10.1016/j.jmacro.2012.03.003

Dickey, D. A., & Fuller, W. A. (1979). Distribution of the estimators for autoregressive time series with a unit root. Journal of the American Statistical Association, 74(366), 427–431. https://doi.org/10.2307/2286348

Daboh, F., Duramany-Lakkoh, E. and Knox-Goba, T. (2024) Analyzing the Structural Relationship between Money Supply, Inflation, and Economic Growth in Sierra Leone: A VAR Model Approach. Theoretical Economics Letters, 14, 1583-1604. https://doi.org/10.4236/tel.2024.144080

Danlami, I. A., Hidthiir, M. H., & Hassan, S. (2019). The asymmetric impact of exchange rate on the inflation rate in Sierra Leone. Global Business Management Review, 11(1), 63–82. https://doi.org/10.32890/gbmr2019.11.1.9318

El Haddadi, A., & Lahjouji, H. (2026). Exchange rate pass-through and food-price inflation in Morocco: Evidence from ARDL and nonlinear models. Journal of Risk and Financial Management, 19(1), 16. https://doi.org/10.3390/jrfm19010016

Goldfajn, I., & Werlang, S. R. C. (2000). The pass-through from depreciation to inflation: A panel study. Banco Central do Brasil Working Paper No. 5. Retrieved from https://ideas.repec.org/p/rio/texdis/423.html

Ikue, J., et al. (2024). Asymmetric exchange rate pass-through to food and headline inflation in Nigeria: Evidence from ARDL and NARDL models. International Journal of Research in Business and Social Science 13(7), pp 282-292. Retrieved from https://ideas.repec.org/a/rbs/ijbrss/v13y2024i7p282-292.html

International Monetary Fund. (Various years). Sierra Leone: Article IV consultation and staff reports. International Monetary Fund. Retrieved from https://www.imf.org/en/publications/cr/issues/2024/11/22/sierra-leone-2024-article-iv-consultation-and-request-for-a-38-month-arrangement-under-the-558772

Kargbo, S. M. (2014). Exchange Rate, Petroleum Price and Price Determination in Sierra Leone. African Economic Research Consortium. Retrieved from https://ideas.repec.org/p/aer/wpaper/2abf4df0-bac6-47dd-ae6b-f1d1d8cb6b54.html

Lavhelalani, T. (2024). Nonlinear and asymmetric exchange rate pass-through to consumer prices in South Africa: A NARDL approach. Retrieved from https://univendspace.univen.ac.za/server/api/core/bitstreams/4901b650-ca93-4e6e-8213-162a8d8c1132/content

Nguyet, N. T. (2026). Asymmetric exchange rate pass-through to consumer price inflation in Vietnam: Evidence from a nonlinear ARDL model. Retrieved from https://ideas.repec.org/a/ajp/edwast/v10y2026i4p370-380id12647.html

Obeng, C. K., Frimpong, S., Amoako, G. K., Agyei, S. K., Asafo-Adjei, E., & Adam, A. M. (2022). Asymmetric exchange rate pass-through to consumer prices in Ghana: Evidence from EMD-NARDL approach. Journal of Mathematics, 2022. https://doi.org/10.1155/2022/9075263

Obradović, S. (2025). Exchange rate and inflation dynamics in Serbia: Evidence from a NARDL framework. Retrieved from https://doi.org/10.61093/fmir.9(1).30-42.2025

Parab, P. (2022). Exchange rate pass-through in India (Working Paper No. WP-2022-012). Indira Gandhi Institute of Development Research, Mumbai. Retrieved from https://ideas.repec.org/p/ind/igiwpp/2022-012.html

Pesaran, M. H., Shin, Y., & Smith, R. J. (2001). Bounds testing approaches to the analysis of level relationships. Journal of Applied Econometrics, 16(3), 289–326. Retrieved from https://www.jstor.org/stable/2678547

Phillips, P. C. B., & Perron, P. (1988). Testing for a unit root in time series regression. Biometrika, 75(2), 335–346. https://doi.org/10.2307/2336182

Sa’ad, S., Usman, M., Omaye, A., & Yau, H. (2023). Oil-price shocks, exchange rate depreciation and inflation asymmetry in Nigeria: Evidence from a NARDL model. European Scientific Journal, ESJ, 19(4). Retrieved from https://doi.org/10.19044/esj.2023.v19n4p1

Salomão Neto, J., & Alves, D. (2025). Asymmetric exchange rate pass-through in Brazil: Evidence from NARDL models. https://doi.org/10.5539/ijef.v18n9p46

Shin, Y., Yu, B., & Greenwood-Nimmo, M. (2014). Modelling asymmetric cointegration and dynamic multipliers in a nonlinear ARDL framework. In R. C. Sickles & W. C. Horrace (Eds.), Festschrift in Honor of Peter Schmidt: Econometric Methods and Applications (pp. 281–314). Springer. https://doi.org/10.1007/978-1-4899-8008-3_9

Syamad, M., & Handoyo, R. D. (2023). Symmetric and asymmetric exchange rate pass-through in inflation-targeting countries: Evidence from ARDL and NARDL models. Jurnal Ilmu Ekonomi Terapan (JIET). Retrieve from https://doi.org/10.20473/jiet.v8i2.45150

Tanku, A., & Skufi, L. (2026). Asymmetric effects of exchange rate movements on headline inflation in Albania: A Q-NARDL approach. SUERF – The European Money and Finance Forum. Retrieved from https://www.suerf.org/publications/suerf-policy-notes-and-briefs/the-asymmetric-effects-of-exchange-rate-on-inflation-a-q-nardl-approach/




DOI: http://dx.doi.org/10.46827/ejefr.v10i6.2306

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