The Impact of Firm Size and Liquidity on the Cost of External Finance in Africa

Established illiquidity measures are constructed for emerging markets in Africa and used to determine which best explains trading costs. Costs of equity are derived from an augmented Capital Asset Pricing Model for a sample of emerging financial markets generally ignored in the literature. These include: South Africa and Namibia, three countries in North Africa and four in Sub‐Saharan Africa (SSA), plus London and Paris as examples of integrated markets. Minimum variance portfolios are constructed and asset weights derived, with the sample divided into countries dependent on their legal regime. Portfolio weights are shown to be directly related to well‐regulated markets with high standards of corporate governance and disclosure, and firms seeking cost‐effective finance from SSA stock markets are at a distinct disadvantage compared with those in Northern Africa, South Africa and, in particular, London and Paris.     

African Stock Markets: Efficiency and Relative Predictability

The weak form of the efficient markets hypothesis is tested for eight African stock markets using three finite‐sample variance ratio tests. A rolling window captures short‐horizon predictability, tracks changes in predictability and is used to rank markets by relative predictability. These stock markets experience successive periods when they are predictable and then not predictable; this is consistent with the adaptive markets hypothesis. The degree of predictability varies widely: the least predictable African stock markets are those located in Egypt, South Africa and Tunisia, while the most predictable are in Kenya, Zambia and Nigeria.     

LIQUIDITY AND THE INFORMATIONAL EFFICIENCY OF AFRICAN STOCK MARKETS

The hypothesis that a stock market price index follows a random walk is tested for 11 African stock markets, Botswana, Côte d'Ivoire, Egypt, Ghana, Kenya, Mauritius, Morocco, Nigeria, South Africa, Tunisia and Zimbabwe using joint variance ratio tests with finite-sample critical values, over the period beginning in January 2000 and ending in September 2006. The iid random walk hypothesis is rejected in all 11 markets. In four stock markets, Egypt, Nigeria, Tunisia and South Africa, weekly returns are a martingale difference sequence. Liquidity is an important factor which contributes to whether a stock market follows a random walk.     

THE CHANGING EFFICIENCY OF AFRICAN STOCK MARKETS

This paper classifies formal African stock markets into four categories and discuses the principal characteristics of the seven markets covered in this study: South Africa, Egypt, Morocco, Nigeria, Zimbabwe, Mauritius and Kenya. Using a GARCH approach with time‐varying parameters, a test of evolving efficiency (TEE) is implemented for periods starting in the early 1990s and ending in June 2001. This test detects changes in weak form efficiency through time. The TEE finds that the Johannesburg stock market is weak form efficient throughout the period, and three stock markets become weak form efficient towards the end of the period: Egypt and Morocco from 1999 and Nigeria from early 2001. These contrast with the Kenya and Zimbabwe stock markets which show no tendency towards weak form efficiency and the Mauritius market which displays a slow tendency to eliminate inefficiency. The paper relates weak form efficiency to stock market turnover, capitalisation and institutional characteristics of markets.     

Equity,Bonds, Institutional Debt and Economic Growth: Evidence from South Africa

We examine the finance‐growth nexus in South Africa accounting for the role of bond markets, stock markets, and bank and non‐bank financial intermediaries using a vector autoregressive technique. Extant empirical literature has largely accounted for only banks and stock markets, ignoring bond market and non‐bank financial intermediaries. We find that bond market development affects economic growth in South Africa, and no similar effect is observed for the bank and non‐bank financial intermediaries and the stock market. Our finding shows that examination of individual elements of the financial system is important in understanding the unique effect of each on growth. The observation that the bond market rather than stock market, bank and non‐bank institutions promote economic growth in South Africa induces an intriguing question as to what unique roles bond markets play that the intermediaries and equity market are unable to play.     

LONG MEMORY IN SOUTHERN AFRICAN STOCK MARKETS

The paper examines long memory in equity returns and volatility for stock markets in Botswana, South Africa and Zimbabwe using the ARFIMA‐FIGARCH model in order to assess the efficiency of these markets in processing information. The findings are diverse. Significant long memory is demonstrated in the equity returns of Botswana; while, in South Africa this result is not statistically different from zero. For Zimbabwe returns are characterised by an anti‐persistent process. Furthermore, all the markets investigated provide evidence of long memory in volatility with the exception of Botswana where there is no evidence of volatility persistence and hence the return from taking risk in this market cannot be predicted on the basis of previous values.     

Sudden Stops and Current Account Reversals: Potential Macroeconomic Consequences for South Africa

South Africa is one of the emerging market countries that have received a relatively large amount of foreign capital since the mid‐2000s. In South Africa's case, these inflows were partly used to build the country's foreign exchange reserves, but more particularly to finance continued large current account deficits. During the course of the past two years, however, adverse domestic political developments, combined with the potential negative impacts of the unwinding of quantitative easing policies and the normalising of monetary policy in the United States on emerging markets in general, has raised the spectre of a sharp slowdown in foreign capital flows to South Africa and an associated reversal of the current deficit. This paper explores the potential impact of such a development on macroeconomic conditions in South Africa. The analysis consists of macroeconometric model‐based alternative scenarios backed up by both the international evidence on the impact of such events and South Africa's own history.     

LIQUIDITY CREATION IN SOUTH AFRICAN BANKS UNDER STRESSED ECONOMIC CONDITIONS

The financial crisis placed severe pressure on global bank liquidity. Many banks were unable to create sufficient liquidity and had to receive government support or face default. This paper attempts to determine the impact of the financial crisis on liquidity creation within South African banks using a model previously applied to US banks. Four measures of liquidity creation are discussed and applied to data spanning 2004‐2009. Although created, liquidity decreases steeply from 2007, liquidity levels in 2009 remain about 45% higher than those of 2004. The four large South African banks created about 80% of the total market liquidity. The authors are aware that the liquidity measures discussed in this paper may not accurately reflect the manner in which South African banks created liquidity before and during the financial crisis as the period under review was characterised by various other factors. These factors include the concurrent rise in securitisation, considerable changes in the South African Reserve Bank's (SARB) stance on monetary policy, historic low‐interest rates during the period and severe curtailing of local inter‐bank dealing. It remains possible that these factors may have had an impact on the way in which South African banks created and disseminated liquidity. This possibility will be the subject of future research.     

An Index‐Based Model for Determining the Investment Benchmark of Renewable Energy Projects in South Africa

In a globalised world, financial markets observe the optimal level of asset allocation and returns based on risk inherent in the economies. Whether public or private investors, they need to have an optimal return on their investment given the finite resources. In relatively new sectors like grid‐connected renewable energy, many investors face difficulty in assessing proper return, making them more averse to financing such projects, affecting transborder project development opportunities. In developing countries like South Africa, which has tremendous potential for renewable energy projects, an arbitrary choice of the required rate of return for project evaluations can negatively affect funding decisions. This paper explores an index‐based model to make fair estimates of the required equity benchmark internal rate of return (IRR) using financial markets observation for renewable energy projects in South Africa. The index‐based model is parsimonious and captures common macroeconomic factors. More specifically, it provides a simple and effective mechanism to calculate IRR for renewable energy projects given different gestation periods.     

INSTITUTIONAL WAGE EFFECTS: REVISITING UNION AND BARGAINING COUNCIL WAGE PREMIA IN SOUTH AFRICA

The literature on the union wage gap in South Africa is extensive, spanning a range of data sets and methodologies. There is, however, little consensus on the appropriate method to correct for the endogeneity of union membership or the size of the union wage gap. Furthermore, there are very few studies on the bargaining council wage premium in South Africa because of lack of data on the coverage of employees under these agreements. Our study, using 2005 Labour Force Survey data, firstly reconsiders the union wage gap controlling for both firm‐level and job characteristics. When correcting for the endogeneity of union status through a two‐stage selection model and including firm size, type of employment, and non‐wage benefits, we find a much lower union wage premium for African workers in the formal sector than premiums reported in some previous studies. Secondly, our study estimates bargaining council wage premiums for the private and public sectors. We find that extension procedures are present in both private and public bargaining council systems but that unions negotiate for additional gains for their members at the plant level. Furthermore, there is some evidence that unions negotiate for awards for their members in the private sector irrespective of bargaining council coverage.     

REGIONAL INTEGRATION OF EQUITY MARKETS IN SUB-SAHARAN AFRICA

Equity markets in developing and emerging economies have grown in number and importance as a result of financial market globalisation. However, their role in economic growth and development is enhanced if nascent markets are integrated with well‐established ones. Market integration, measured by the transmission of returns volatility, is identified across a sample of SSA countries, using a unique dataset. Evidence for potential integration between financial markets in Sub‐Saharan Africa (SSA) is found. Spillovers are found across markets, some unidirectional and others bi‐directional. However, continued illiquidity and incomplete institutions indicate that an integrated financial community remains premature, and considerable regulatory reform and harmonisation will be necessary for this to succeed.     

Monetary Policy Implementation and Volatility Transmission Along the Yield Curve: The Case of Kenya

This paper analyses the degree to which volatility in interbank interest rates leads to volatility in financial instruments with longer maturities (e.g. T‐bills) in Kenya since 2012, year in which the monetary policy framework switched to a forward‐looking approach, relative to seven other inflation targeting (IT) countries (Ghana, Hungary, Poland, South Africa, Sweden, Thailand and Uganda). Kenya shows strong volatility transmission and high persistence similar to other countries in transition to a more forwardlooking monetary policy framework. These results emphasize the importance of a strong commitment to an interbank rate as an operational target and suggest that the central bank could reduce uncertainty in short‐term yields significantly by smoothing out the overnight interest rates around the policy rate.     

REVISITING THE EFFICIENT MARKET HYPOTHESIS FOR AFRICAN COUNTRIES: PANEL SURKSS TEST WITH A FOURIER FUNCTION

This study applies the panel seeming unrelated regression of the Kapetanios‐Shin‐Snell (SURKSS) test with a Fourier function to investigate the time‐series properties of stock prices in five African countries (i.e. Egypt, Kenya, Morocco, South Africa and Tunisia) over the period of January 2000–April 2011. The empirical results from the univariate unit root and panel‐based unit root tests indicate that unit root hypothesis can not be rejected for these five countries under study. However, results from the panel SURKSS test with a Fourier function indicate that unit root hypothesis can be rejected for Egypt and Morocco, two countries under study. Our results indicate that the weak‐form efficient market hypothesis holds in the other three countries, namely, Kenya, South Africa and Tunisia.     

Major International Information Flows Across the Safex Wheat Market

We study information flows across four wheat futures markets on four continents: Zhengzhou Commodity Exchange (ZCE), South African Futures Exchange (SAFEX), Euronext/Liffe and Kansas City Board of Trade (KCBT). Three approaches for studying information flows among non‐synchronous markets are applied: cointegration techniques, vector autoregressive analysis and multiple regression proposed. Although comparable underlying assets are traded in the four markets, our results indicate that no long‐run links exist among them. ZCE is by far the most endogenous market, and Euronext/Liffe is the most exogenous one. Finally, the model points to KCBT as the most influential and sensitive wheat market. Our findings indicate that the relative openness of the SAFEX wheat market supports information flows and linkages from KCBT and Euronext/Liffe. Therefore, our results suggest that more supportive policies to incentivise higher wheat production in South Africa are required to mitigate the impact of price shocks emanating from the global wheat markets.     

Global Financial Crises and Time‐Varying Volatility Comovement in World Equity Markets

This paper studies volatility comovement in world equity markets between 1994 and 2008. Global volatility factors are extracted from a panel of monthly volatility proxies relating to 25 developed and 20 emerging stock markets. A dynamic factor model (FM) is estimated using two‐year rolling‐window regressions. The FM's time‐varying variance shares of global factors map variations in volatility comovement over time and across countries. The results indicate that global volatility linkages are significantly stronger during financial crisis periods in Asia (1997‐1998), Brazil (1999), Russia (1998) and the United States (2000, 2007‐2008). Emerging markets are weakly synchronised with world volatility in comparison with developed markets. In particular, emerging market comovement is significantly lower than developed market comovement during the Asian and US sub‐prime crises. This suggests a degree of decoupling of emerging markets from the global drivers of volatility during these periods.     

The liquidity of the London capital markets, 1825–70†

This article examines the liquidity of the London capital markets in the decades following the liberalization of UK incorporation law. Using comprehensive stock and bond data, we calculate a measure of market liquidity for the period 1825–70. We find that stock market liquidity trended upwards but bond market liquidity did not increase over the sample period. Stock market liquidity during our sample period was partially influenced by the bond market, rather than fluctuations in economic output. In our analysis of the cross‐sectional determinants of individual stock liquidity, we find that firm size and the number of issued shares were important determinants of liquidity.  Finally, we find little evidence of an illiquidity premium, which is consistent with the view that investors did not price liquidity in this nascent market.     

The impact of economic fundamentals on stock markets in southern Africa

The issue of whether stock markets reflect economic fundamentals or speculative bubbles is an important one for their potential role in allocating capital, and relates to a policy issue of whether stock markets should be encouraged in developing countries. This article examines the impact of both domestic and foreign economic factors on real stock market returns in three southern African stock markets – South Africa, Zimbabwe and Botswana, from 1985-95 – using cointegration and error correction techniques. It finds that, while in all cases stock markets are influenced by domestic economic growth, there are no common patterns beyond this. The influence of other domestic and economic variables depends on the size, openness and market-orientation of the individual economies, as well as the size and liquidity of the various stock exchanges. Where foreign economic variables are important, they appear to be those related to trade, rather than international capital flows, indicating that there is little integration of these capital markets, whether regionally or internationally.     

Systemic Risks Spillovers and Interdependence among Stock Markets: International Evidence with Covar‐Copulas

Empirical studies have provided ample evidence on the potential benefits of international diversification with portfolios that consist of both domestic and foreign assets. This coupled with sudden and periodic crashes in global and developed equity markets have stimulated the interest of investors to diversify across markets that have the potential to provide decorrelation with global markets during turbulent periods. At the same time, international diversification may intensify cross‐border listing of stocks with its antecedent implication of shocks transmission. The above have engendered renewed interest among researchers to explore the dependence levels and spillover effects of shocks among emerging and developed equity markets. This paper examines tail dependence structure and (extreme) systemic risks spillover effects among international equity markets using advanced econometric techniques that underpin the modelling of asset returns. We find evidence of low positive significant dependencies between all African markets and their developed counterparts, except for Egypt. Although no evidence of spillover effects to the markets in Africa was found, both unidirectional and bi‐directional causality between some African and developed equity markets is found, albeit with differences. We are unable to ascribe the dynamics in the causality structure to level of market integration. It is inferred that the degree of individual local markets interdependence with developed counterparts may reflect the relative size, liquidity and degree of foreign investors' participation.     

Why Do Property‐Liability Insurers Destroy Liquidity? Evidence from South Africa

This paper examines liquidity creation behaviour in the property‐liability insurance market in South Africa. Using annual data on 76 insurers from 2007 to 2014, the paper employs the three‐stage approach to estimate liquidity creation. The results suggest that property‐liability insurers are characterised by liquidity destruction by transforming liquid assets in cash and investable securities into illiquid reserves liabilities. The findings also indicate that the R1.32 billion in liquid assets were transformed into illiquid reserves liabilities in 2014, an increase from the R700 million liquidity de‐created in 2007. The increases were mainly driven by large insurers which accounted for about 70% liquidity de‐created. The results of panel regression analysis provide evidence in support of the “risk‐absorption” hypothesis which argues that high levels of capital increases liquidity creation. In addition, size, leverage and reinsurance were also identified as the firm‐level factors that explain liquidity creation. The policy implications of the findings are discussed.     

Size and liquidity effects in Japanese regional stock markets

This paper assesses the effectiveness of traded turnover, Amihud (2002) and Liu (2006) metrics in measuring illiquidity, as used in a multifactor CAPM. The performance of this model is contrasted using a unique sample from Japan’s regional stock exchanges, namely Sapporo, Nagoya, Fukuoka, Osaka and Tokyo. The evidence suggests that size effects are important in Tokyo, liquidity plays a more important role in the conditional modelling of returns particularly in the smaller markets of Sapporo, Fukuoka and Nagoya where costs of equity are highest.