Rui Dias – School of Business and Administration, Polytechnic Institute of Setúbal, Portugal and CEFAGE-UE, IIFA,
University of Évora, Portugal
Paula Heliodoro – School of Business and Administration, Polytechnic Institute of Setúbal, Portugal
Paulo Alexandre – School of Business and Administration, Polytechnic Institute of Setúbal, Portugal
Hortense Santos – School of Business and Administration, Polytechnic Institute of Setúbal, Portugal
Cristina Vasco – IEFP, Portugal
5th International Scientific Conference – EMAN 2021 – Economics and Management: How to Cope With Disrupted Times, Online/Virtual, March 18, 2021, CONFERENCE PROCEEDINGS published by: Association of Economists and Managers of the Balkans, Belgrade, Serbia; ISBN 978-86-80194-43-1, ISSN 2683-4510
This essay aims to analyze the efficiency, in its weak form, in the Exchange Markets IDR/MYR
(Indonesia-Malaysia), IDR/PHP (Indonesia-Philippines), IDR/SGD (Indonesia-Singapore), IDR/THB
(Indonesia-Thailand), IDR/GBP (Indonesia-UK), IDR/US (Indonesia-USA), IDR/EUR (Indonesia-Euro
Zone/Europe). The sample comprises the period from September 3, 2018, to October 20, 2020, and the
sample was partitioned into two subperiods: Pre-Covid and Covid. To carry out this analysis, different
approaches were undertaken to assess whether: (i) the global pandemic promoted in(efficiency) in the
exchange rates of Indonesia vs Malaysia, Philippines, Singapore, Thailand, UK, USA, Eurozone? The
results suggest that in the Pre-Covid subperiod we can see that the random walk hypothesis is rejected,
IDR/MYR (0.61), IDR/SGD (0.60), IDR/US (0.59), IDR/THB (0.56), IDR/EUR (0.55), IDR/GBP (0.54),
except for the IDR/PHP pair (0.45) which evidences anti persistence. Already in the Covid period, we
noticed that persistence increased significantly, like followed, IDR/EUR (0.82), IDR/PHP (0.81) IDR/SGD
(0.80), IDR/US (0.80), IDR/MYR (0.78), IDR/THB (0.71), IDR/GBP (0.62). These findings show high levels
of arbitrage, i.e., investors will be able to obtain abnormal profitability without incurring the additional
risk, which could jeopardize the implementation of efficient portfolio diversification strategies due to
market imbalance. The authors believe that these findings can help policymakers formulate a comprehensive
response to improve the efficiency of the foreign exchange market during a global pandemic event.
Exchange rates, Efficiency, Arbitration, Portfolio diversification.
Al-Khazali, O.M., Pyun, C. S., & Kim, D. (2012). Are exchange rate movements predictable
in Asia-Pacific markets? Evidence of random walk and martingale difference processes.
International Review of Economics and Finance. https://doi.org/10.1016/j.iref.2011.07.002
Alexandre, P., Dias, R., & Heliodoro, P. (2020). European Financial Market Integration: A Closer
Look at Government Bonds in Eurozone Countries. Balkans Journal of Emerging Trends
in Social Sciences. https://doi.org/10.31410/balkans.jetss.2020.3.1.78-86
Alexandre, P., Heliodoro, P., & Dias, R. (2019). The Contagion Effect in Europe: A DCC Garh
Approach. In 5th LIMEN Conference Proceedings (part of LIMEN conference collection).
Anggitawati, D., & Ekaputra, I. A. (2020). Foreign Portfolio Investment Flows and Exchange
Rate: Evidence in Indonesia. Emerging Markets Finance and Trade. https://doi.org/10.108
Aslan, F., Aziz, S., Nguyen, D. K., Mughal, K. S., & Khan, M. (2020). On the efficiency of foreign
exchange markets in times of the COVID-19 pandemic. Technological Forecasting
and Social Change. https://doi.org/10.1016/j.techfore.2020.120261
Azad, A. S.M. (2009). Random walk and efficiency tests in the Asia-Pacific foreign exchange
markets: Evidence from the post-Asian currency crisis data. Research in International
Business and Finance. https://doi.org/10.1016/j.ribaf.2008.11.001
Belaire-Franch, J., & Opong, K. K. (2010). Testing for random walk in euro exchange rates using
the subsampling approach. Applied Economics Letters.
Chaudhry, A. F., Hanif, M.M., Hassan, S., & Chani, M. I. (2019). Efficiency of the Black Foreign
Exchange Market. International Journal of Economics and Finance. https://doi.org/10.5539/
Chiang, S.M., Lee, Y. H., Su, H.M., & Tzou, Y. P. (2010). Efficiency tests of foreign exchange markets
for four Asian Countries. Research in International Business and Finance. HTTPS://
Çıtak, L., Akel, V., & Çetin, M. (2016). Testing random walk hypothesis in Turkish foreign exchange
market. In International Business: Concepts, Methodologies, Tools, and Applications.
Dias, R., & Carvalho, L. (2020). Hedges and Safe Havens: An Examination of Stocks, Gold and
Silver in Latin America ‘ S Stock Market, 1114–1132.
Dias, R., Alexandre, P., & Heliodoro, P. (2020). Contagion in the LAC Financial Markets: The
Impact of Stock Crises of 2008 and 2010. Littera Scripta. https://doi.org/10.36708/littera_
Dias, R., da Silva, J. V., & Dionysus, A. (2019). Financial markets of the LAC region: Does the
crisis influence the financial integration? International Review of Financial Analysis, 63
(January), 160–173. https://doi.org/10.1016/j.irfa.2019.02.008
Dias, R., Heliodoro, P., & Alexandre, P. (2019). Risk Transmission Among Stock Markets in LAC
Region: Financial Crises Impact. In 5th LIMEN Selected Papers (part of LIMEN conference
Dias, R., Heliodoro, P., & Alexandre, P. (2020). Efficiency of Asean-5 Markets: An Detrended
Fluctuation Analysis. Mednarodno Inovativno Poslovanje = Journal of Innovative Business
and Management. https://doi.org/10.32015/jibm.2020.12.2.13-19
Dias, R., Heliodoro, P., Alexandre, P., & Vasco, C. (2020a). Financial Market Integration of
ASEAN-5 with China: An Econophysics Approach. In 4th EMAN Conference Proceedings
(part of EMAN conference collection). https://doi.org/10.31410/eman.2020.17
Dias, R., Heliodoro, P., Alexandre, P., & Vasco, C. (2020b). The Shocks Between Oil Market to
the BRIC Stock Markets: A Generalized VAR Approach. In 4th EMAN Conference Proceedings
(part of EMAN conference collection). https://doi.org/10.31410/eman.2020.25
Dias, R., Pardal, P., Teixeira, N., & Machová, V. (2020). Financial Market Integration of ASEAN-
5 with China. Littera Scripta. https://doi.org/10.36708/littera_scripta2020/1/4
Dias, R., Teixeira, N., Machova, V., Sparrow, P., Horak, J., & Vochozka, M. (2020). Random walks
and market efficiency tests: evidence on US, Chinese and European capital markets within
the context of the global Covid-19 pandemic, 11(4). https://doi.org/10.24136/oc.2020.024
Fame, E. F., & French, K. R. (1988). Dividend yields and expected stock returns. Journal of Financial
Ferreira, P., Dionísio, A., Guedes, E. F., & Zebende, G. F. (2018). A sliding windows approach to
analyse the evolution of bank shares in the European Union. Physica A: Statistical Mechanics
and Its Applications, 490, 1355–1367. https://doi.org/10.1016/j.physa.2017.08.095
Hadri, K. (2000). Testing for stationarity in heterogeneous panel data. The Econometrics Journal.
Heliodoro, P., Dias, R., & Alexandre, P. (2020). Financial Contagion Between the US And Emerging
Markets: COVID-19 Pandemic Case. In 4th EMAN Selected Papers (part of EMAN
conference collection). https://doi.org/10.31410/eman.s.p.2020.1
Heliodoro, P., Dias, R., Alexandre, P., & Vasco, C. (2020). Integration in BRIC Stock Markets:
An Empirical Analysis. In 4th EMAN Selected Papers (part of EMAN conference collection).
Jarque, C.M., & Bera, A. K. (1980). Efficient tests for normality, homoscedasticity and serial
independence of regression residuals. Economics Letters, 6(3), 255–259. https://doi.
Jr., A.C.C., & Camba, A. L. (2020). The Existence of Random Walk in the Philippine Stock
Market: Evidence from Unit Root and Variance-Ratio Tests. The Journal of Asian Finance,
Economics and Business. https://doi.org/10.13106/jafeb.2020.vol7.no10.523
Kantelhardt, J. W., Koscielny-Bunde, E., Rego, H. H., Havlin, S., & Bunde, A. (2001). Detecting
long-range correlations with detrended fluctuation analysis. Physica A: Statistical Mechanics
and Its Applications, 295 (3–4), 441–454. https://doi.org/10.1016/S0378-4371(01)00144-3
Levin, A., Lin, C. F., & Chu, C. S. J. (2002). Unit root tests in panel data: Asymptotic and finite-sample
properties. Journal of Econometrics. https://doi.org/10.1016/S0304-4076(01)00098-7
Nan, Z., & Kaizoji, T. (2019). Market efficiency of the bitcoin exchange rate: Weak and semistrong
form tests with the spot, futures and forward foreign exchange rates. International
Review of Financial Analysis. https://doi.org/10.1016/j.irfa.2019.06.003.
Njindan Iyke, B. (2019). A Test of the Efficiency of the Foreign Exchange Market in Indonesia.
Buletin Ekonomi Moneter Dan Perbankan. https://doi.org/10.21098/bemp.v0i0.976
Olufemi, A. P., Adewale, A. O., & Oseko, M. S. (2017). Efficiency of Foreign Exchange Markets
in Sub-Saharan Africa in the Presence of Structural Break: A Linear and Non-Linear Testing
Approach. Journal of Economics and Behavioral Studies. https://doi.org/10.22610/jebs.
Palma, A. A., & Sartoris, A. (2016). Weak-Form Market Efficiency of the Brazilian Exchange
Rate: Evidence from an Artificial Neural Network Model. Latin American Business Review.
Sparrow, P., Dias, R., Šuleř, P., Teixeira, N., & Krulický, T. (2020). Integration in Central European
capital markets in the context of the global COVID-19 pandemic. Equilibrium. Quarterly
Journal of Economics and Economic Policy, 15(4), 627–650. doi: 10.24136/eq. 2020,027
Poterba, J.M., & Summers, L. H. (1988). Mean reversion in stock prices. Evidence and Implications.
Journal of Financial Economics. https://doi.org/10.1016/0304-405X(88)90021-9
Santos, H. & Dias, R. (2020). The Interactions of Stock Prices and Exchange Rates in the ASEAN-
5 Countries: The DCCA approach. Research in Theory and Practice in Contemporary
Business Issues opportunity. ISBN: 9789617061093
Sheik, M.M., & Banu, M. A., Study on Weak-Form Efficiency of Foreign Exchange Markets of
Developing Economies: Some India Evidence. International Journal of Management