South african exchange rate after 2000s: an econometric investigation

Kebalo, Leleng (2016): South african exchange rate after 2000s: an econometric investigation.

Abstract

This paper is an econometric investigation, an analysis on the difficulty of modeling the south african exchange rate. The aim of our paper is to examine the nature of the existing relationship between the real exchange rate of the Rand, real prices of gold, platinum and the real interest rate differential through different empirical models, and this over the period going from January 2000 to September 2014. Our analysis shows that, over the same period, with different empirical methods, the variables used in the paper can be the determinants of the real value of the south african Rand, but at different horizons. To achieve our goals, long run (Engle and Granger (1987) ; Johansen (1988)) and short run (VAR process (Sims (1980))) analysis have been performed. We come to the conclusion that, the determinants of the Rand change according to the methods used and these do not therefore allow us to have robust results. The long run analysis performed by Engle and Granger approach result to a lack of long run relationship among our variables. To have an robust idea on the lack of long run relationship, we have performed another long run analysis: the vector error correction model (VECM approach) of Johansen which results on the existing of one co-integrating relation among real value of te Rand and their determinants. However, because of the lack of long run relationship resulting of the Engle and Granger approach, we have performed a short run analysis with the vector autoregressive process. We find that only the real platinum price in our study is a short term determinant of the real value of the Rand. The real impact is effective only at the end of the first quarter with a real appreciation of the Rand. The main surprise is the absence of impact of real price of gold shock on the real value of the Rand. Analyzed the south african exchange rate through one empirical method/model to find theirs determinants can be biased.

• Item Type: MPRA Paper
• Language: English
• Keywords: Exchange rate, South Africa, Vector Auto-Regressive, Co-integration
• Subjects: C - Mathematical and Quantitative Methods > C5 - Econometric Modeling; E - Macroeconomics and Monetary Economics > E4 - Money and Interest Rates > E44 - Financial Markets and the Macroeconomy; F - International Economics > F3 - International Finance; F - International Economics > F4 - Macroeconomic Aspects of International Trade and Finance

References

Apergis and Papoulakos, D. (2013). The australian dollar and gold prices. The Open Economics Journal.

Arezki, Dumitrescu, E., Freytag, A., and Quintyn, M. (2012). Commodity prices and exchange rate volatility: Lessons from south africa’s capital account liberalization. IMF Working Paper.

Cashin, P., Céspedes, L. F., and Sahay, R. (2004). Commodity currencies and the real exchange rate. Journal of Development Economics, pages 239–268.

Chen, Y. and k. Rogoff (2003). Commodity currencies. Journal of International Economics, 60:133–160.

Égert, B. (2012). Nominal and real exchange rate models in south africa: How robust are they? CEsifo Working Paper N:3853, Category 7: Monetary policy and International finance.

Engle, R. and Granger, C. (1987). Co-integration and error correction: Representation, estimation, and testing. Econometrica, 55:251–276.

Granger, C. (1981). Some properties of time series data and their use in econometric model spécification. Journal of Econometrics, pages 121–130.

Granger, C. (1983). Cointegrating variables and error correcting models. pages 83–113.

Hoffmann, M. and MacDonald, R. (2009). Real exchange rates and real interest rate differentials: a present value interpretation. Institute for Empirical Research in Economics University of Zurich, Working Paper Series, pages 1424–1459.

Jager, S. D. (2012). Modelling south africa’s equilibrium real effective exchange rate: A vecm approach. South African Reserve Bank Working Paper.

Jeffrey, F. (2007). On the rand: Determinants of the south african exchange rate. South African Journal of Economics, 75(3):425–441.

Johansen, S. (1988). Statistical analysis of cointegration vectors. Journal of Economics Dynamics and Control, 12:231–254.

Johansen, S. and Juselius, K. (1990). Maximum likelihood estimation and inference on cointegration with applications to demand for money. Oxford Bulletin of Economics and Statistics, 52:169–210.

Johansen, S. and Juselius, K. (1992). Testing structural hypothesis in a multivariate cointegration analysis of the ppp and the uip for uk. Journal of Econometrics, 53:211–244.

Macdonald, R. and Ricci, L. (2003). Estimation of the equilibrium real exchange rate for south africa. IMF working paper.

Ndung’u, N. S. (2000). The exchange rate and the interest rate differential in kenya: A monetary and fiscal policy dilemma. Kenya Institute for Public Policy Research and Analysis, KIPPRA Discussion Paper, (1).

Sims, C. A. (1980). Macroeconomics and reality. Econometrica, 48:1–48.