Regulate one service,tame the entire market: Credit cards in Turkey

In credit card markets banks provide both payment and credit services. Two regulations were recently enacted in the Turkish credit card market: one on payment services in 2005 and the other on credit services in 2006. By employing the well-known  and  method and a unique quarterly data set for 21 Turkish banks between 2002 and 2008, we investigate the extent of banks’ market power in the Turkish credit card market before and after the regulations. Unlike most of the existing literature, which considers competition and regulation for either credit or payment services and ignores the externalities between them, we consider the entire market by taking both services into account. Fixed effects estimations reveal that banks enjoyed collusive oligopoly power before the regulations. Although the first regulation did not have much impact, the second led to rises in both banks’ total revenues and competition in the entire market.     

Analysing dynamic linkages and hedging strategies between Islamic and conventional sector equity indexes

This study analyses the dynamic spillovers across 10 Dow Jones Islamic and conventional sector index pairs. Using various multivariate GARCH models, the results show significant time-varying conditional correlations for all the pairs. Moreover, there is evidence that the conditional correlations for all the sector pairs, except those of the Telecommunication and Utilities sectors, increase after the onset of the global financial crisis (GFC), suggesting non-subsiding risks, contagion effects and gradual greater financial linkages. The Islamic sectors’ risk exposure can be effectively hedged over time in diversified portfolios containing conventional sector stocks. These results provide several practical implications for portfolio managers and policymakers in regard to optimal asset allocations, portfolio risk management and the diversification benefits among these markets.     

Temporal dynamics of trust in ongoing inter-organizational relationships

This paper reports the results of a qualitative study undertaken to understand the nature of trust and its consequences for both suppliers and buyers in short term (relatively new) and long term (older/more mature) relationships in inter-organizational contexts. Scholars have recently pointed out the importance of research that investigates the temporal characteristics and dynamics of trust in inter-organizational studies. Our paper responds to this call by indentifying the changing nature of the level of trust as the buyer–supplier relationship matures. Our findings contribute to sparse and conflicting previous research on the relationship between length of partnership and perceptions of trust, types of dark side consequences of trusting relationships, and reasons buyers and suppliers continue or terminate low/no-trust associations. Specifically, we illustrate that buyers and suppliers draw on substantially different metaphors for understanding the nature of trust in long and short term exchange relationships. Suppliers see marked differences in trust with long term versus short term exchange partners, while buyers see little or no difference. Suppliers and buyers also appear to have different conceptions of how trust is nested (or not) within the broader economic and/or personal relationship. Through our inductive model, we elaborate several types of betrayal and disappointment, distinguish several factors that lead suppliers and buyers to stay in relationships with partners they don't trust, and identify key issues that topple untrusting relationships into terminated relationships.     

Statistical Arbitrage with Pairs Trading

We analyze statistical arbitrage with pairs trading assuming that the spread of two assets follows a mean‐reverting Ornstein–Uhlenbeck process around a long‐term equilibrium level. Within this framework, we prove the existence of statistical arbitrage and derive optimality conditions for trading the spread portfolio. In the existence of uncertainty in the long‐term mean and the volatility of the spread, statistical arbitrage is no longer guaranteed. However, the asymptotic probability of loss can be bounded as a function of the standard error of the model parameters. The proposed framework provides a new filtering technique for identifying best pairs in the market. Backtesting results are given for some of the pairs of stocks that are studied in the literature.     

Job creation and temporary emigration: the Albanian experience1

This paper focuses on job flows and unemployment in Albania during the transition from a closed, communist system to an open, free-market economy, and examines the role of emigration in the restructuring of the country. Our theoretical model indicates that in Albania, temporary emigration may have a significant positive effect on hiring in the private sector, reducing unemployment. Using sectoral data on employment, we illustrate the importance of emigration as an alternative for the Albanian labour force, and we measure the extent to which job ‘destruction’ in some sectors of the economy has been compensated for by job ‘creation’ in others. On these grounds, we compare the progress of Albania with other former socialist countries in Europe.     

Stable schedule matching under revealed preference

Baiou and Balinski (Math. Oper. Res., 27 (2002) 485) studied schedule matching where one determines the partnerships that form and how much time they spend together, under the assumption that each agent has a ranking on all potential partners. Here we study schedule matching under more general preferences that extend the substitutable preferences in Roth (Econometrica 52 (1984) 47) by an extension of the revealed preference approach in Alkan (Econom. Theory 19 (2002) 737). We give a generalization of the Gale-Shapley algorithm and show that some familiar properties of ordinary stable matchings continue to hold. Our main result is that, when preferences satisfy an additional property called size monotonicity, stable matchings are a lattice under the joint preferences of all agents on each side and have other interesting structural properties.     

The Estimation of the Relationships between Water-Natural Gas Usage and Discharge-Emission Permission by Using Binary Logistic Model for the Industrial Establishments

The Thrace region is one of the most important agricultural and industrial regions in Turkey with its plain, deep and productive soil structure. The most important problem is industrial based water and air pollution in this region. In this study, 90 out of 541 establishments that use industrial water in the region were studied representing approximately 17% of the total population. The relationship between water-natural gas usage and discharge-emission permission is estimated by using the binary logistic model. In addition to the economic and social benefits, there are also economic and social losses due to environmental pollution because of the rapid industrialization in the Thrace Region. For example; the rice producers that use Ergene River for irrigation purposes lose efficiency and quality in various levels due to water pollution. According to the research results, an increase in wastewater is a factor that decreases the probability of obtaining discharge permission. Moreover, excessive use of underground water results in decreases in static and dynamic water levels in the region. Because of this result, it is more advantageous for sustainable water management to be directed to the sectors that do not use water for industrial purposes instead of the sectors that use water in their processes.     

The life satisfaction of teachers at work place,research of structural equation modelling regarding general and organized cynicism

This research aims to determine both the predictive role and level of teachers’ life satisfaction, as well as general and organizational cynic perceptions in their workplace. The study sample was composed of 457 teachers who worked in the middle schools in the center and districts of Konya in 2016, who were randomly selected by group sampling. Analysis of the research data was conducted using the statistical program AMOS 18.0, according to structural equation modeling. In the research, loneliness in teachers’ professional lives was considered in two dimensions: as “emotional deprivation” and “social friendship.” According to the research findings, it is evident that organizational cynicism is the most important variable affecting teachers’ emotional deprivation and social companionship levels. The second most important variable affecting teachers' levels of emotional deprivation is general cynicism, while social companionship levels are more affected by life satisfaction. It is also seen that there is a negative relationship between the emotional deprivation and social friendship and life satisfaction variables. The results also demonstrate a slight but statistically significant relationship between the general cynicism and the social friendship levels of teachers.     

Self-employment rates and business size: the roles of occupational choice and credit market frictions

Self-employment rates and project size vary greatly across countries. The main message of this paper is that these broad regularities are consistent with an environment in which a common self-employment technology is available worldwide, but where (a) financial intermediation costs and (b) alternatives in “paid” work differ greatly. Our model indicates that alternatives in paid work are crucial for explaining self-employment rates, whereas high financial intermediation costs primarily affect the scale of projects. We also show that credit use is not informative for predicting either rates of self-employment or the scale of self-employment projects.