STOCHASTIC FRONTIER ANALYSIS OF SPECIALIST SURGEON CLINICS

Stochastic frontier analysis was used to estimate the technical efficiency of specialist surgeon practices based in Gauteng Province, South Africa. The analysis was conducted for both single and multiple output production functions, while efficiency was allowed to depend upon surgeon and practice characteristics. Multiple output models, due to an increase in the number of observations, can be more precisely estimated and, as there are multiple observations per surgeon, can be estimated with fixed effects. The results of the analyses suggest that efficiency averages around 50% for this sample and is convex in years of surgical experience. The benefit of multiple output analysis – improved precision – obtains, while surgeon‐level fixed effects alleviate some concerns related to unobserved heterogeneity.     

TECHNICAL EFFICIENCY AND PRODUCTIVITY POTENTIAL OF COCOA FARMERS IN WEST AFRICAN COUNTRIES

This paper uses survey data to examine the technical efficiency and productivity potential of cocoa farmers in West and Central Africa. Separate stochastic frontier models are estimated for farmers in Cameroon, Ghana, Nigeria, and Côte d’Ivoire, along with a stochastic metaproduction frontier to obtain alternative estimates for the technical efficiencies of farmers in the different countries. The mean productivity potential of cocoa farmers is also estimated, by using a decomposition result applied to both the national and the metaproduction frontiers. The determinants of technical efficiency are assessed to identify the reasons for differences across countries.     

MEASURING THE OPERATIONAL EFFICIENCY OF COMMERCIAL BANKS IN NAMIBIA

This paper examines the efficiency of commercial banks in Namibia using the standard econometric frontier approach. Although two aspects of efficiency (scale and scope) receive our attention, the emphasis is on the latter which pertains to whether a firm produces as efficiently as it possibly can, given its size. Our results indicate that substantial economies of scale exist in commercial banking in Namibia. This will tend to suggest that commercial banks in Namibia can increase their efficiency by increasing their current scale of operation. The results for scope economies show that the current level of input combination does not make for maximum efficiency as sufficient scope exists for a more efficient combination of inputs. We believe this will reduce operating costs in the industry and stimulate efficiency.     

RESOURCE ALLOCATION AND EFFICIENCY OF SHARECROPPING UNDER UNCERTAINTY*

The paper examines how efficiency of sharecropping under uncertainty can be tested empirically. It demonstrates even under uncertainty, equality of factor ratios between sharecropped land and owner-cultivated land supports the hypothesis that the terms of share contracts are effectively enforced by landlords, so as to achieve socially optimum resource allocation and risk sharing, unless the direct elasticities of substitution are identically equal to one. It also provides evidence, that the comparative yield tests conducted in different parts of South and Southeast Asia support the efficiency view of sharecropping.     

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.     

THE EFFECT OF ACCESS TO IMPROVED WATER SOURCES AND SANITATION ON ECONOMIC EFFICIENCY: THE CASE OF SUB‐SAHARAN AFRICAN COUNTRIES

This paper evaluates the effect of access to improved water sources and sanitation on 41 sub‐Saharan African (SSA) countries' economic efficiency and growth. For this reason data envelopment analysis (DEA), bootstrap techniques and probabilistic approaches are used. The empirical results indicate that SSA countries' economic efficiency is positively influenced by the access of population both on improved water sources and sanitation. Finally, when the provision of access to improved water sources is provided to more than 50% of the population, the positive effect on countries' economic efficiency is much greater compared with the effect of providing sustainable access to improved sanitation to the same proportion of population.     

THE TECHNICAL INEFFICIENCY EFFECTS OF TURKISH BANKS AFTER FINANCIAL LIBERALIZATION

The banking sector in Turkey has grown significantly over the last two decades of financial liberalization. One of the aims of the financial liberalization was to improve efficiency through restructuring programs including the privatization of state banks and the encouragement of mergers. In this paper we identify key factors determining the technical efficiency differentials among Turkish commercial banks in the pre‐ and post‐liberalization periods, using the technical inefficiency effects model. We found that loan quality, size, ownership of the banks, and profitability have a positive and significant impact on the technical efficiencies of banks. The results warrant implementation of effective regulatory measures to improve the quality of the earning assets of commercial banks. Furthermore, steps by the government to encourage acquisitions or mergers for private banks and the privatization of state‐owned banks seem to be consistent in improving the overall efficiency of commercial banking in Turkey.     

THE SPEED OF STRUCTURAL CONVERGENCE IN THE MANUFACTURING INDUSTRIES OF NEWLY INDUSTRIALISING ECONOMIES

We seek to identify the determinants of the speed of convergence in the structures of manufacturing to their steady-state levels as developing economies become fully industrialised. Applying a two-stage sequential estimation procedure to data on three-digit manufacturing industries for 45 mostly middle-income countries, we find empirical support for the hypothesis that production efficiency is a major determinant of inter-branch output share adjustment. This finding applies to many but not all industries. One implication for latecomers is that industrial policy must aim at rapid diffusion of core technologies to facilitate the acquisition of industrial capabilities in a diversified basket of exportables.     

EXPLAINING THE MARKET POWER OF GHANAIAN BANKS1

A competitive banking system helps lower transaction costs and risks. It also helps make financial markets more efficient. In Ghana however, observers believe that the banking industry is not competitive and point to the huge spread between bank lending and borrowing rates as evidence. The Ghanaian banking industry is analysed for evidence of market power by computing the Lerner Index of banks using quarterly data from 2001 to 2006. The evidence is that Ghanaian banks possess market power. Factors that significantly explain the market power of Ghanaian banks are: bank size, efficiency of banks with respect to staff costs, the macroeconomic environment and time.     

EFFICIENCY OF CHINESE TOWNSHIP AND VILLAGE ENTERPRISES IN THE 1990s BASED ON MICRO DATA FOR WUXI CITY, 1991–97

We examine the (technical) efficiency of collective‐owned township and village enterprises (COTVEs) in Wuxi City, China, after 1990 to study whether the acknowledged success of township and village enterprises continued in the late 1990s. Our results suggest that COTVEs did not decline in relative efficiency compared with other types of enterprises in the late 1990s, but that their productivity leveled off or declined. Furthermore, we find that COTVEs faced with a more serious shortage of working capital had a lower efficiency after the mid‐1990s recession. These findings cast doubt on the view that the vaguely specified property rights of COTVEs are responsible for their declining performance problems during the period just before 1998 when massive privatization began. Privatization of COTVEs without other macroeconomic policy changes may now be insufficient to cope effectively with their declining productivity.     

PRICE ELASTICITIES AND PRICING POWER IN EMERGING MARKETS: THE CASE OF PETROCHEMICAL‐DERIVED PLASTICS IN SOUTH AFRICA1

This paper examines whether there necessarily exists a conflict between allocative and productive efficiency in small open economy markets. That productive efficiency favours market concentration is not in dispute, and the sole question we face is whether allocative efficiency suffers under high market concentration. We proceed theoretically and econometrically. We find that the conflict between productive and allocative efficiency is not necessarily as stringent as the international competition policy literature suggests should be the case. In particular, we note that the strategic interaction between the large domestic producer and its competitors makes feasible a range of alternative price elasticities of demand, and empirically that all price elasticities of demand are less than or equal to unity. Nevertheless, the impact of market structure is such as to render feasible a wide range of possible levels of pricing power.     

FOREIGN DIRECT INVESTMENT IN ZIMBABWE: THE ROLE OF INSTITUTIONAL AND MACROECONOMIC FACTORS

The purpose of our research is to examine the impact of property rights on foreign direct investment (FDI) in Zimbabwe for the period 1964‐2005. While the macroeconomic determinants of FDI have been analysed to a considerable extent in past empirical work, the role of institutional factors such as the protection of property rights and the efficiency of the legal system has been underexplored. Using a multivariate cointegration framework, we use a newly constructed de jure property rights index for Zimbabwe to determine the impact of property rights on FDI. The empirical evidence shows that property rights are consistently an important explanatory variable of FDI in Zimbabwe, even after controlling for periods when there are no significant new foreign capital inflows. Other significant explanatory variables of FDI in Zimbabwe are the real gross domestic product (GDP), capital intensity, the external debt to GDP ratio, political instability as well as the educational levels.     

THE RELOCATION OF THE INTERNATIONAL MARKET FOR AUSTRALIAN WOOL

The marketplace for Australian wool relocated from London to the Australian capital cities in the half-century after 1880. This represented a major institutional shift that underpinned the development of the Australian economy and made Australia the centre of the international wool market. We analyse the principal demand and supply changes underlying this market shift. Consolidation of worsted manufacturing, demand diversification, improved transport and communications, Australian dominance of international wool production and the growth of the small grazier, shifted the relative market efficiency in favour of Australian auctions.     

Backyard Hog Production Efficiency: Evidence from the Philippines*

This article investigates the economic efficiency and the factors associated with efficiency for a sample of 126 hog producers in the Philippines. The input‐oriented efficiency indices are computed and bootstrapped using data envelopment analysis. Econometric analysis of the factors influencing the efficiency indices are conducted using the Tobit model. Fixed capital does not influence the efficiency scores, whereas labor does negatively influence the efficiency indices. On average, technical efficiency is low, an indication that most households are not using the most efficient technology. Scale efficiency is fairly high but constrained by lack of operating capital and managerial skills. Technical efficiency is constrained by lack of access to credit and limited experience in hog production.     

TECHNICAL EFFICIENCY IN PRODUCTION IN A DEVELOPING COUNTRY: AN EMPIRICAL EXAMINATION OF THE BRAZILIAN PLASTICS AND STEEL INDUSTRIES

This paper estimates firm specific indexes of technical efficiencyfor the Brazilian plastics and steel industries. Two differentindexes are employed for the empirical estimates—the Farrellindex and an index developed from a linear programming approximationof a nonstochastic frontier production function specified inthe Cobb-Douglas functional form. Evidence of substantial relativetechnical inefficiency is revealed. In both industries onlya very small proportion of all the observed firms were producingamounts of output greater than 80 percent of that technicallypossible on the estimated frontier. Relative efficiency of thefirms in the two industries was not seen to be significantlyrelated to ownership (foreign or government), but tests didsuggest a tendency for larger firms, possessing larger marketshares, to be closer to the frontier than smaller firms.     

Perspectives on the Sources of Heterogeneity in Indian Industry

This paper examines technical efficiency variation across four industrial sectors in India using a stochastic production frontier technique. The results obtained are comparable to technical efficiency distribution patterns obtained in other countries. Heterogeneity in firm-level efficiency is examined against internal, firm-level and external, industry and location characteristics. The results suggest that managerial effectiveness significantly influences efficiency and that there are considerable benefits deriving from location within established industrial clusters for particular industries. The methodology and findings indicate that the study of industry-specific technical efficiency patterns is a useful analytic tool for tracking firm response to ongoing liberalization.     

工程项目绩效评价方法与实证研究：文献综述及研究展望

建筑业是国民经济的支柱产业之一,评价建筑业的效率具有重要意义。建筑业绩效评价从只重视财务指标,发展到各类绩效考核综合评价体系。这些绩效评价方式因为简单易行而在实践中得到广泛运用,但缺点是依赖于可比数据才能得到评价结论,并非“真实”效率情况。为得到真实效率状况还可以对建筑企业和工程项目资源配置效率和技术效率进行评价。通过全面总结各类工程项目绩效评价方法,有助于实践中改进评价方法,推动相关研究的进一步深入。     

FURTHER EVIDENCE OF LONG MEMORY IN THE SOUTH AFRICAN STOCK MARKET

This paper expands and augments the results of the paper by Jefferis and Thupayagale ) and tests the efficiency of the South African stock market with Wavelet and Markov Switching Regime analyses of selected shares and the a ALSI 40 data. The Wavelet analysis indicated that most of the individual share prices and the share index time series are mean reverting over the long run and follow a long memory process, offering evidence against weak-form efficient market hypothesis (EMH). The Markov model modelled the financial and prevalent economic conditions accurately and established the presence of patterns in the historic time series, providing additional support against the weak-form EMH.     

天津港保税区高新技术企业创新效率及影响因素研究——基于数据包络分析方法和托宾模型

以天津港保税区2022年通过高新认定的226家高新技术企业为例，运用数据包络分析方法（DEA），从整体视角、级别视角、领域视角等多维度对企业创新效率进行评价，并采用托宾（Tobit）模型对创新效率的影响因素进行探究。结果表明，保税区高新技术企业中有15.49%达到最佳有效，73.01%的企业达到一般及以上能力水平，创新效率仍有提升空间；创新效率主要受纯技术效率限制；科技领军型高新技术企业创新效率最高、普通型次之、瞪羚型最低；不同技术领域高新技术企业创新效率差异明显；股权集中度、企业规模促进了创新效率提升，税收负担抑制创新效率。根据实证结果提出了天津港保税区提升高新技术企业创新效率的对策建议。     

Regulatory regimes and efficiency in US local telephony

The paper assesses the efficiency consequences of differentregulatory regimes for US local telephony. Specifically, alternativeregulatory regimens (price-cap regulation and incentive regulation)are contrasted with traditional rate-of-return regulation (ROR).Relative efficiency scores are obtained from the Data EnvelopmentAnalysis (DEA) approach. The regression analysis on the determinantsof efficiency, after controlling for technical change effects,indicates that alternative forms of regulation appear to inducea higher level of efficiency for the regulated firms than ROR.