Single Equation Models; Single Variables: Time-Series Models; Dynamic Quantile Regressions; Dynamic Treatment Effect Models

Modelling Systemic Risk in the South African Banking Sector Using CoVar

In this paper we model systemic risk by making use of the conditional quantile regression to identify the most systemically important and vulnerable banks in the South Africa (SA) banking sector. We measure the marginal contributions of each bank to systemic risk by computing the delta Conditional Value at Risk which measures the difference between system risk of individual banks when they are in a normal state and when they are in distress state.

The Interdependence between the Saving Rate and Technology across Regimes: Evidence from South Africa

This paper hypothesises that the saving rate and technological progress are interdependently determined by a common exogenous source, so that an exogenous shock to the saving rate determines long-run growth transitions. In an open economy, the saving rate measures the quality of capital investment.

Do monetary policy announcements affect foreign exchange returns and volatility? Some evidence from high-frequency intra-day South African data.

This paper examines the temporal effect of domestic monetary policy surprises on both the levels and volatility of the South African rand/United States dollar exchange rate. The analysis in this ‘event study’ proceeds using intra-day minute-by-minute exchange rate data, repo rate data from the South African Reserve Bank’s scheduled monetary policy announcements, and Bloomberg market consensus repo rate forecasts.

The Effects of Exchange Rate Volatility on South African Investments

This paper analysed the short- and long-run interactions between the exchange rate and different types of investments in South Africa from 1970 to 2014. The Vector Autoregressive model (VAR), a multivariate Johansen co-integration approach and Granger causality test were conducted to analyse the interactions between the exchange rate and different types of investments. The short-run analysis found that there was a short-run relationship between the exchange rate and different types of investments in South Africa.

The Determinants of Exchange Rate Volatility in South Africa

This paper investigates the determinants of exchange rate volatility in South Africa for the period 1986-2013 using the New Open Economy Macroeconomics model by Obstfeld & Rogoff (1996) and Hau (2002). The main focus of the paper is to test the hypothesis that economic openness decreases Rand (ZAR) volatility. This follows South Africa's liberalisation of its capital account in the mid-1990s and the mixed results in the literature on the relationship between exchange rate volatility and economic openness. Employing monthly time series data, GARCH models are estimated.

Structural Breaks in Renewable Energy in South Africa: A Bai & Perron Test Approach

South Africa has been struggling to cope with its energy demand. In order to remedy the problem, the government of South Africa has committed itself to pursuing renewable energy as a viable alternative to traditional sources such as fossil fuels. The aim of this study is to understand whether or not the policies pursued by the South African government in the period 1990-2010 have had any effect on the behaviour of consumers and producers of renewable energy.

On the Term Structure of South African Interest Rates: Cointegration and Threshold Adjustment

This paper explores the correlations of the short- and long-term interest rate series through time in South Africa. Two time series techniques are utilized: the Kapetanios et al. (2003) nonlinear STAR unit root test and the asymmetric cointegration with threshold adjustment test of Enders and Siklos (2001). We find the interest rate series (i.e. the SARB policy rate and the yield on long-term government bonds) to be cointegrated with fairly weak threshold adjustment.

Nonlinear Econometric Approaches in Testing PPP of SADC Economies towards Monetary Union

The theory of purchasing power parity implies that real exchange rate series should be stationary. However, conventional unit root tests on the Southern African Development community (SADC) real exchange rates confirm the existence of a unit root. Such deficiencies in the investigation of the dynamics of real exchange rates in the region calls for nonlinear methods like the method used in this study to be pursued, which may better explain the dynamics of real exchange rates in SADC.

Debt sustainability and financial crises in South Africa

This study assesses debt sustainability in South Africa allowing for possible nonlinearities in the form of threshold behaviour by fiscal authorities. A long historical data series on the debt-to-GDP ratio and models with fixed and time-varying thresholds allowing the level of debt to vary relative to its recent history and the occurrence of financial crises are used in the analysis. First, the results reveal that fiscal consolidation occurs at a much lower debt-to-GDP ratio of 46 percent in the period 1946 to 2010 compared to 65 percent in the period 1865 to 1945.

Copius Structural Shifts in Exchange Rates of the South African Rand (Post-1994): Do They Matter (for Unit Root Testing)? What are the Most Likely Triggers?

There is a theoretical case for real exchange rates to be stationary, but conventional unit root tests generally find nonstationarity in most economic data expressed in nominal terms; exchange rates in particular. Perron (1989) questioned the latter interpretation on the basis that the presence of a unit root may be a manifestation of not allowing for structural change — a finding reaffirmed later by Zivot and Andrews (1992) and Clemente et al (1998) when single and double sudden and gradual endogenous breakpoints are accounted for in unit root tests.


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