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The behaviour of the real effective rate of South Africa: is there a misalignment

Melvin M. Khomo and Meshach J. Aziakpono
Publication date
July 2017
Results endorse the existence of a cointegrating relationship between the exchange rate and terms of trade (including gold), external openness, capital flows and government expenditure. A 1% increase in the country’s terms of trade leads to an appreciation in the real effective exchange rate of about 0.82%. A similar directional relationship is observed between capital flows and the exchange rate. Increases (1%) in external openness and government expenditure however cause depreciation in the exchange rate of 0.85% and 0.37% respectively. We also confirm that the exchange rate deviates from its equilibrium level over time with the historical misalignment pattern witnessed confirming similar observations from previous studies including De Jager (2012), Saayman (2010) and MacDonald and Ricci (2004). The Markov Switching Model correctly captures the misalignment over the sample period (1985-2014) as distinct episodes of overvaluation and undervaluation.
Four overvaluation episodes are identified (1986-1988; 1997-1998; 2003-2006 and 2010-2012) with the study indicating that the exchange rate was undervalued (to deferring extents) over most of the period studied. Extreme undervaluation in the exchange rate is recorded in 1998-2003, and during the midst of the global financial crisis in 2007/2008. Results of the study also indicate that the currency was undervalued between 2013 and 2014. An interesting observation from the study is that the exchange rate tended to be more undervalued than overvalued over the period studied with undervaluation episodes lasting longer than overvaluation periods. A closer look at the trade figures over the sample period indicates that South Africa’s imports have been growing faster than exports thus feeding into the current account deficit problem. On the one hand, such developments should have been expected to be inflationary, but inflation on average came down over this period mainly due to a successful inflation targeting monetary policy framework by the South African Reserve Bank. The challenge for the SARB is the ability to deal with abrupt exchange rate misalignment episodes that are accompanied by high levels of nominal exchange rate volatility.
With an undervalued currency seen as supportive for growth through higher exports (Rodrik, 2008a), the question is why has the country failed to take advantage of such misalignment episodes? From a policy perspective, this means policymakers have to look at other factors in an effort to boost export performance since there is no clear evidence that the exchange rate has been detrimental to exports. Rodrik (2008b) notes that South Africa’s unsatisfactory growth and employment path realized since the democratic transition is a function of an under-performing, non-resources tradable sector, in particular manufacturing. With the country’s unemployment rate very high (especially amongst unskilled labour), having more flexible labour laws where wages are linked to productivity could be one way of boosting the manufacturing sector and hence more exports. There is a need for government, organized labour (unions) and the private sector to work together to find sustainable solutions to these challenges. In terms of further research, it would be interesting to formally ascertain the impact of such a misalignment on economic indicators such as growth, exports and the current account deficit. Since the study merely sought to measure if the exchange rate was misaligned over time, another future area of research would be to determine the factors that drive such a misalignment within a regime switching context.
  • Clark PB and MacDonald R. (1988). Exchange rates and economic fundamentals: a comparison of BEERs and REERs. IMF Working Paper No. 98/67.
  • De Jager S. (2012). Modelling South Africa’s equilibrium real effective exchange rate: a VECM approach. South African Reserve Bank Working Paper WP/12/02.
  • MacDonald R and Ricci LR. (2004) Estimating the Equilibrium Real Exchange Rate for South Africa. South African Journal of Economics Vol 72(2).
  • Saayman A. (2010). A panel data approach to the behavioural equilibrium exchange rate of the ZAR. South African Journal of Economics 78: 57-75.
  • Rodrik D. (2008a). The Real Exchange Rate and Economic Growth. Brookings Papers on Economic Activity 2: 365–412.
  • Rodrik D. (2008b). Understanding South Africa’s economic puzzles. Economics of Transition 16(4): 769-797.
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Series title
Research Brief 120