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91.
    
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92.
Abstract

The purpose of this study is to find a portfolio that maximizes the risk-adjusted returns subject to constraints frequently faced during portfolio management by extending the classical Markowitz mean–variance portfolio optimization model. We propose a new two-step heuristic approach, GRASP & SOLVER, that evaluates the desirability of an asset by combining several properties about it into a single parameter. Using a real-life data set, we conduct a simulation study to compare our solution to a benchmark (S&P 500 index). We find that our method generates solutions satisfying nearly all of the constraints within reasonable computational time (under an hour), at the expense of a 13% reduction in the annual return of the portfolio, highlighting the effect of introducing these practice-based constraints.  相似文献   
93.
  总被引:3,自引:0,他引:3  
This article assesses the impact of the Avian Influenza (AI) outbreak in the Turkish poultry market by focusing on price transmission at producer and retail levels. The relationship and patterns of transmission between producer and retail prices are analysed by estimating a Regime-Switching Vector Error Correction Model with three regimes. An AI information index variable is developed and used to determine regime-switching. Results suggest that consumer prices adjust to disequilibrium caused by the AI crisis, while producer prices are sticky and slowly responsive.  相似文献   
94.
We study the causal effects of analyst coverage on corporate investment and financing policies. We hypothesize that a decrease in analyst coverage increases information asymmetry and thus increases the cost of capital; as a result, firms decrease their investment and financing. We use broker closures and broker mergers to identify changes in analyst coverage that are exogenous to corporate policies. Using a difference‐in‐differences approach, we find that firms that lose an analyst decrease their investment and financing by 1.9% and 2.0% of total assets, respectively, compared to similar firms that do not lose an analyst.  相似文献   
95.
    
This paper argues that deepening commodification in Turkish agriculture has changed the lives of farmers in significant ways. Global circuits have swept away the accustomed networks of information, production and marketing which had been largely established and maintained by comprehensive governmental support policies. New institutions have come into the picture establishing the links between small producers and larger markets. With state policy strengthening the domination of the market, prices and demand patterns fluctuate widely leaving small producers vulnerable to market forces and raising the level of risk and insecurity. This situation brings about a rapid de‐ruralization of the population in most regions of the country. In the fertile coastal strip of the southern and western provinces, however, commercial opportunities introduced by global circuits have led to a thriving market in products, land, and labour. Farming of vegetables and fruits for domestic and European markets dominate agricultural production. Seasonal employment, in tourism and in labour‐intensive crops, supplement household incomes, permitting the rural population to remain in the countryside.  相似文献   
96.
Summary. Nearly all observational learning models assume that individuals can observe all the decisions that have previously been made. In reality, such perfect information is rarely available. To explore the difference between observational learning under perfect and imperfect information, this paper takes an experimental look at a situation in which individuals learn by observing the behavior of their immediate predecessors. Our experimental design uses the procedures of Çelen and Kariv [9] and is based on the theory of Çelen and Kariv [10]. We find that imitation is much less frequent when subjects have imperfect information, even less frequent than the theory predicts. Further, while we find strong evidence that under perfect information a form of generalized Bayesian behavior adequately explains behavior in the laboratory, under imperfect information behavior is not consistent even with this generalization of Bayesian behavior.Received: 29 January 2002, Revised: 12 May 2004, JEL Classification Numbers: C92, D8. Correspondence to: Boaçhan ÇelenWe completed most of this paper when we were both graduate students at New York University. This research was supported by the Center for Experimental Social Sciences (C.E.S.S.) and the C.V. Starr Center for Applied Economics at New York University. We are grateful to Andrew Schotter for his guidance and to an anonymous referee for his comments. We benefited from the expositional suggestions of William Baumol. We also acknowledge helpful discussions of Colin Camerer, Liran Einav, Xavier Gabaix, Douglas Gale, Charles Holt, David Laibson, and Matthew Rabin. We also benefited from suggestions by the participants of the 2002 International ESA Meeting and seminars at several universities.  相似文献   
97.
The paper analyzes the strategic waiting tendencies of IPO firms. Our game theoretic model shows why some high-quality firms may strategically delay their initial public offering until a favorable signal about the economic conditions is generated by other issuing firms. Survival analysis suggests that IPOs in the highest quality decile have significantly higher median waiting days (since the start of a rising IPO cycle) than the IPOs in the lowest decile. During the early stages of an expanding IPO cycle the average firm quality is lower than in its later stages. We find supporting evidence also from the IPOs of future S&P 500 firms.  相似文献   
98.
    
The aim of this study is to investigate the effects of government spending shocks on the real exchange rate and foreign trade balance in Turkey for the period of 2002:01–2012:04 within a structural VAR framework. The analysis shows that a positive shock to the government spending tends to induce real exchange rate appreciation and deterioration in trade balance. We also find that the composition of the government spending matters. Although shocks to the government nonwage consumption generate an appreciation in the real exchange rate and worsening of the trade balance, the effects of government investment shocks remain insignificant. Furthermore, the analysis demonstrates that shocks to government spending are associated with a rise in taxes, which is indicative of a spending-driven tax adjustment process in Turkey.  相似文献   
99.
    
Through the lens of a DSGE model, I find that financial shocks in conjunction with downward nominal wage rigidities (DNWR) are important features in explaining the degree of asymmetry that U.S. business cycles exhibit. Financial shocks are constructed as residuals of the borrowing constraint faced by firms in a similar fashion to Jermann and Quadrini (2012). The effects of these shocks on aggregate quantity variables are amplified by DNWR, especially during the global financial crisis. Moreover, my model explains a large part of the upward shift in the labor wedge that occurred during this recession.  相似文献   
100.
In this study, we examine whether the mandatory adoption of IFRS by Turkish listed companies in 2005 was successful in practice and what role firm and country level factors played in the adoption. We determine the firm-specific factors that affect the degree of change in both measurement and disclosures by conducting a multivariate analysis. Further, we conduct interviews with external auditors to throw light on the challenges associated with adoption and the outcomes of adoption. We find that while the standards clearly impact certain accounts, adoption is not uniform across accounts. The overall measurement change is positively associated with auditor prominence and gearing, and negatively associated with the degree of free float. With regard to disclosures, we find that although there are some improvements, the vast majority of the disclosure items required by IFRS were not disclosed. Auditor type, size, and the degree of foreign ownership of shares exert a positive impact on the overall improvement in disclosures. Our interview analysis reveals that the dominance of tax laws, the lack of enforcement, corporate governance issues, and inadequate management information systems were all significant constraints to the successful adoption of IFRS.  相似文献   
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