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.     

Asymmetry of information flow between volatilities across time scales

Conventional time series analysis, focusing exclusively on a time series at a given scale, lacks the ability to explain the nature of the data-generating process. A process equation that successfully explains daily price changes, for example, is unable to characterize the nature of hourly price changes. On the other hand, statistical properties of monthly price changes are often not fully covered by a model based on daily price changes. In this paper, we simultaneously model regimes of volatilities at multiple time scales through wavelet-domain hidden Markov models. We establish an important stylized property of volatility across different time scales. We call this property asymmetric vertical dependence. It is asymmetric in the sense that a low volatility state (regime) at a long time horizon is most likely followed by low volatility states at shorter time horizons. On the other hand, a high volatility state at long time horizons does not necessarily imply a high volatility state at shorter time horizons. Our analysis provides evidence that volatility is a mixture of high and low volatility regimes, resulting in a distribution that is non-Gaussian. This result has important implications regarding the scaling behavior of volatility, and, consequently, the calculation of risk at different time scales.     

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.     

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.     

Environmental soundness: a pragmatic alternative to expectations of sustainable development in business strategy

In recent years, many companies have responded publicly to pressure to improve their environmental performance. The paradigm within which these responses have been made, however, appears to be confused. This paper proposes the role that companies are best able to play in the societal progression towards sustainable development. We argue that the concept of sustainable development may only be properly applied at the global level; it follows that a ‘sustainably developed’ company or industry sector is not a practical objective. Nevertheless, the contribution which business can make within a sustainable development framework is recognized as being of the highest importance. We suggest that the nature of this contribution pivots around a distinction between environmental soundness (which concerns the interaction between the environment and economics) and sustainability (which adds a broad social element to the environmental and economic, and requires the consideration of time horizons). It is proposed that companies are well positioned to pursue effective environmentally sound corporate strategies. It is also argued that such strategies offer great potential to advance social justice, as environmental improvements are often disproportionately beneficial to poorer groups in society. In contrast, arguments are presented against companies attempting to move beyond environmental soundness to address those broad social elements demanded by sustainable development. A broad allocation of those responsibilities inherent in sustainable development to societal institutions is presented, placing the suggested role of business into context. In advocating the adoption of corporate strategies based on environmental soundness we do not seek to derogate the concept of sustainable development; we do aim to stem the apparent continuing erosion of its fundamental tenets and to identify responsibilities that are appropriate to business. Copyright © 1999 John Wiley & Sons, Ltd and ERP Environment.     

Changing the Size of a Futures Contract: Liquidity and Microstructure Effects

We analyze the relation between contract size and liquidity using data from the respecification of Sydney Future Exchange's (SFE) Share Price Index (SPI) and 90-day Bank Accepted Bill (BAB) futures contracts. Respecification of SPI and BAB contracts presents a unique opportunity to investigate the effects of a change in futures contract size. SFE decreased the size of SPI futures by a factor of four while increasing its minimum tick. The BAB contract was doubled in size with the minimum tick size left unchanged. We find, after controlling for market factors, that the respecification of the SPI futures resulted in higher trading volume, while that of BAB futures decreased trading volume. The results regarding spreads are ambiguous. Based on two cases investigated, we conclude that decreasing the futures contract size was effective in terms of enhancing liquidity while increasing the size resulted in a reduction in liquidity.     

How Do Financial Constraints Relate to Financial Reporting Quality? Evidence from Seasoned Equity Offerings

This paper examines how constraints on firms’ financing capacity relate to managers’ discretionary accounting choices. Three hypotheses of earnings management – the opportunism hypothesis, the rational expectations hypothesis, and the signaling hypothesis – predict that constrained firms engage in greater upward earnings management than unconstrained firms when selling equity. Using a sample of seasoned equity offerings (SEOs) announced between 1983 and 2014, I find support for this prediction. The relation between financial constraints and earnings management is robust to including controls such as offer size, growth opportunities, analyst following, and chief executive officer equity holdings, as well as to using the instrumental variable approach. Investors’ reaction around and following the SEO announcement supports the rational expectations hypothesis. I find that aggressive earnings management by constrained issuers is associated with lower SEO announcement returns but is not followed by negative abnormal returns in the long run. The evidence suggests that constrained issuers’ aggressive use of income-increasing accruals is an outcome of managerial myopia caused by capital market pressure, not managerial opportunism intended to mislead investors.     

Small producers,supermarkets, and the role of intermediaries in Turkey's fresh fruit and vegetable market

A wide range of empirical studies show the extent to which the rise of supermarkets in developing countries transforms domestic marketing channels. In many countries, the exclusion of small producers from so‐called dynamic marketing channels (that is, remunerative ones) has become a concern. Based on data collected in Turkey in 2007 at the producer and the wholesale market levels, we show that intermediaries are important to understanding the impact of downstream restructuring (supermarkets) on upstream decisions (producers). Results show first that producers are not aware of the final buyer of their produce, because intermediaries hinder the visibility of the marketing channel, thereby restricting a producer's choice to that of the first intermediary. Econometric results show that producers who are indirectly linked to the supermarkets are more sensitive to their requirements in terms of quality and packaging than to the price premia compensating the effort made to meet standards. Therefore, the results lead us to question the role of the wholesale market agents who act as a buffer in the chain and protect small producers from negative shocks, but who stop positive shocks as well, and thereby reduce incentives.     

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.