This thesis presents an empirical investigation into the Arbitrage Pricing Theory (APT). At the onset of the thesis it is recognised that tests of the APT are conditional on a number of preconditions and assumptions. The first line of investigation examines the effect of the assumed nature of the form of the return generating process of stocks. It is found that stocks follow an approximate factor structure and tests of the APT are sensitive to the specified form of the return generating process. We provide an efficient estimation methodology for the case when stocks follow an approximate factor structure. The second issue we raise is that of the appropriate factors, the role of the market portfolio and the performance of the APT against the Capital Asset Pricing Model (CAPM). The conclusions that we draw are that the APT is robust to a number of specified alternatives and furthermore, the APT outperforms the CAPM in comparative tests. In addition, within the APT specification there is a role for the market portfolio. Through a comparison of the results in chapters 2 and 3 it is evident that the APT is not robust to the specification of unexpected components. We evaluate the validity of extant techniques in this respect and find that they are unlikely to be representative of agents actual unexpected components. Consequently we put forth an alternative methodology based upon estimating expectations from a learning scheme. This technique is valid in respect to our prior assumptions. Having addressed these preconditions and assumptions that arise in tests of the APT a thorough investigation into the empirical content of the APT is then undertaken. Concentrating on the issues that the return generating process must be unique and that the estimated risk premia should be stable overtime the results indicate that the APT does have empirical content. Finally, armed with the empirically valid APT we proceed to analyse the issue of seasonalities in stock returns. The results confirm previous findings that there are seasonal patterns in the UK stock market, however, unlike previous findings we show that these seasonal patterns are part of the risk return structure and can be explained by the yearly business cycle. Furthermore, the APT retains empirical content when these seasonal patterns are removed from the data. The overall finding of this thesis is that the APT does have empirical content and provides a good description of the return generating process of UK stocks.

Ill., Univ. of Chicago, Graduate School of Business, Diss.--Chicago, 2005. / Kopie, ersch. im Verl. UMI, Ann Arbor, Mich. - Enth. 2 Beitr.

Calif., Univ. of California, Diss.--Berkeley, 2002. / Kopie, ersch. im Verl. UMI, Ann Arbor, Mich. - Enth. 3 Beitr.

Tex., Univ., C. T. Bauer College of Business, Diss.--Houston, 2002. / Kopie, ersch. im Verl. UMI, Ann Arbor, Mich. - Enth. 2 Beitr.

Calif., Univ. of California, Diss.--Berkeley, 2002. / Kopie, ersch. im Verl. UMI, Ann Arbor, Mich. - Enth. 3 Beitr.

University, Diss.--Mainz, 2007.

Techn. Univ., Diss.--Berlin, 2002.

Liquidity is a measure of the ease with which an asset can be converted into cash. In a perfectly liquid market, conversion is instantaneous and does not incur costs. Amihud and Mendelson (1986:224) proposed that illiquidity increases the expected return on an investment (liquidity premium) and simultaneously lengthens the holding period. These two effects are known respectively as the “spread-return relationship” and the “clientele effect” and have theoretical as well as practical implications. From a theoretical perspective it may help to explain the gap between the capital asset pricing model (which assumes that markets are perfectly liquid) and the associated empirical evidence; which thus far has been rather poor. From a practical perspective, liquidity will influence stakeholders’ decisions and market competitiveness (Amihud&Mendelson, 1991:61-64). The relevant stakeholders are governments, stock exchange regulators, corporations, investors and financial intermediaries. Emerging economies such as the South African economy typically have less liquid markets than the developed world. While this may be attractive for investors looking for higher returns, Amihud and Mendelson (1991:61) are of the opinion that liquid markets are more generally favoured by investors. Constantinides (1986:842-858), also proposes a model for liquidity, but found the liquidity premium to be of lesser importance than that proposed by Amihud and Mendelson (1986:223-231) but also supports the suggestion that investors will favour liquid markets. Although it is by no means a perfect proxy, a security’s bid-ask spread has been found to be an attractive and effective measure of liquidity. It has been found to correlate with beta as well as market capitalisation and several other variables commonly used in capital markets research. Because of this correlation the effect of the bid-ask spread cannot be studied in isolation when regression techniques are employed (Ramanathan, 1998:166). This is particularly problematic because empirical evidence for beta, which is arguably the most important independent variable in financial cross sectional relationships, is weak. Beta has to be estimated and so it is not clear if real markets do not support CAPM theory or if beta cannot be estimated with the required accuracy. All of the common independent variables used in empirical capital markets research are correlated to beta, and for this reason it cannot be established if these variables have a real effect or if they are simply serving as a proxy for the difference between the real and the estimated beta. Various strategies have been proposed to increase the accuracy of beta estimation and these are discussed in detail in this research. Successes with these strategies have been mixed. A second problem encountered in the empirical research base relating to the CAPM is that in the theory the cross-sectional relationship is between expected market return (which cannot be observed due to the vast number of real investments beyond those listed on exchanges) and beta, whereas empirical research makes use of actual return on a market proxy and beta. In order for the actual return to approach the expected return, empirical studies have to be conducted over extended periods. Accurate data for such periods are generally lacking and severe macro-economic changes such as wars, may also affect rational economic behaviour. It has to be kept in mind that the entire CAPM theory flows from the simple assumption that investors aim to achieve the highest return per unit of risk, and so a rejection of beta is a rejection of rational investor behaviour. Liquidity however, addresses one of the assumptions of CAPM, namely that markets are perfectly liquid; which obviously is not met in real markets and so CAPM models expanded for liquidity should be a reasonably fundamental starting point for all empirical capital markets research. The current empirical evidence for the spread-return relationship is inconclusive. While some researchers have found a significant relationship, others have questioned the ability of the methodology to differentiate a true relationship from the ‘proxy for errors in the estimated beta’ problem. Deductions (as explained in section 4.3) that have been made from the research of Marshall and Young (2003:176-186) in particular, provide strong evidence that at least some of the relationship is due to the ‘errors in estimated beta’ problem. Little empirical work has been done on the clientele effect. Atkins and Dyl (1997:318-321) found a significant relationship between holding period and bid-ask spread, although their approach was somewhat unorthodox in the sense that portfolio formation was not done and the effect of beta was not tested. This study tests empirically both the spread-return relationship and the clientele effect on the Johannesburg Stock Exchange over the period stretching from January 2002 to June 2007. The methodology of Fama and Macbeth (1973:614-617) as well as the aggregated beta of Dimson (1979:203-204) were mainly used, with some modifications as suggested by other researchers. With regard to the spread-return relationship, the findings of this study do not support theoretical expectations. This may be due to the short time period that was used as well as the difficulty in estimating beta. To the contrary, very significant evidence for the clientele effect was found, with little to no influence from market capitalisation and beta, which is as expected. Further investigation into the spread-return relationship is required. If a liquidity premium is not present, foreign investors will favour liquid developed markets above the JSE. This implies that efforts of exchange regulators and the government to decrease illiquidity will lead to foreign portfolio investment inflow into the South African economy. / Dissertation (MBA)--University of Pretoria, 2008. / Graduate School of Management / unrestricted

No description available.

El presente trabajo de investigación analiza el estado del arte de los ajustes y adaptaciones que se han impuesto al modelo Capital Asset Pricing Model (CAPM) para habilitar su aplicabilidad en mercados emergentes, con el fin de valorar correctamente los activos financieros y estimar la rentabilidad esperada en función del riesgo, es justo mencionar que, desde la publicación del modelo han surgido constantes críticas que lo califican de ineficaz en mercados emergentes, basándose particularmente en que, el modelo representa el riesgo a través de una sola variable que es medida por el riesgo sistemático y que fue originalmente diseñada para mercados desarrollados; en tal sentido, se han presentado propuestas de diversos especialistas que con sus teorías recomiendan ajustar el beta o ponderarlo, otras propuestas sugieren incluir variables como el diferencial de crédito, riesgo país y lambda, con lo que sostienen que es significativamente importante la necesidad de tener que adecuar el modelo a mercados emergentes caracterizados particularmente por ser riesgosos y tener alta volatilidad debido a los constantes cambios en sus variables económicos y financieros. / The following research analyzes the state of the art of the adjustments and adaptations imposed on the Capital Asset Pricing Model (CAPM) in order to enable its applicability on emerging markets, with the aim to value properly financial assets as well as estimate the expected profitability depending on the risk, It is fair to mention that, since the publication of the model, there has been severe criticism on its effectiveness for emerging markets, based on the fact that, the model displays the risk through a single variable that is measured by the systematic risk and that was originally designed for developed markets; in this sense, several proposals have been introduced by specialists suggesting wiht his theories to either adjust the Beta or weighted it, and other proposals suggest including variables such as credit spread, country risk and lambda, with which they maintain that it would be of the utmost importance to adapt the model to emerging markets, particularly characterized for being risky and have feature high volatility due to the constant fluctuations both in their economic and financial variables. / Trabajo de Suficiencia Profesional