中国联通已经和韩国的 SK 电讯携手合作:国内大型汽车制造厂中或多或少都会找到外资的背景管理规范的餐饮公司几乎都有外资的影子,甚至是直接引进国外著名品牌,如“麦当劳”和“星期五”。如果把中外合资比作“结婚”,上面的这些是已经...中国联通已经和韩国的 SK 电讯携手合作:国内大型汽车制造厂中或多或少都会找到外资的背景管理规范的餐饮公司几乎都有外资的影子,甚至是直接引进国外著名品牌,如“麦当劳”和“星期五”。如果把中外合资比作“结婚”,上面的这些是已经成婚的。还有更多的中外企业在谈“恋爱”,比如百威啤酒和青岛啤酒、葛兰素史克和重庆太极。当然也有不少合资公司正在“打离婚”,或者已经“分居”,比如惠而浦和上海水仙、雀巢和青岛乳业。展开更多
Instead of existing methods,a recurrent neural network is conceived to deal with three stages of portfolio management.Mainly,a deterministic annealing neural network is proposed for the approach to portfolio problem,w...Instead of existing methods,a recurrent neural network is conceived to deal with three stages of portfolio management.Mainly,a deterministic annealing neural network is proposed for the approach to portfolio problem,which is a kind of quadratic programming.Finally,through a real example,we verify that the neural network model proposed in this paper is a good tool to solve the portfolio problem.展开更多
Portfolio selection is one of the major capital allocation and budgeting issues in financial management, and a variety of models have been presented for optimal selection. Semi-variance is usually considered as a risk...Portfolio selection is one of the major capital allocation and budgeting issues in financial management, and a variety of models have been presented for optimal selection. Semi-variance is usually considered as a risk factor in drawing up an efficient frontier and the optimal portfolio. Since semi-variance offers a better estimation of the actual risk portfolio, it was used as a measure to approximate the risk of investment in this work. The optimal portfolio selection is one of the non-deterministic polynomial(NP)-hard problems that have not been presented in an exact algorithm, which can solve this problem in a polynomial time. Meta-heuristic algorithms are usually used to solve such problems. A novel hybrid harmony search and artificial bee colony algorithm and its application were introduced in order to draw efficient frontier portfolios. Computational results show that this algorithm is more successful than the harmony search method and genetic algorithm. In addition, it is more accurate in finding optimal solutions at all levels of risk and return.展开更多
In this paper, a tractable solution is proposed to integrate, to a certain extent, market liquidity risk in the portfolio selection process. It is shown how an investor may take advantage of this additional risk sourc...In this paper, a tractable solution is proposed to integrate, to a certain extent, market liquidity risk in the portfolio selection process. It is shown how an investor may take advantage of this additional risk source within the standard mean-variance optimization framework, by in certain circumstances overcoming the pitfalls of illiquidity and in others seizing a liquidity premium. Bid prices appear effective to capture liquidity risk. The efficient frontier conceived with bid prices consists of mean-variance optimal allocations that cover more liquid stocks （large caps） under stressed market conditions and less liquid stocks （small caps） under normal conditions.展开更多
This paper examines the role of innovation in firm performance by drawing empirical evidence from the capital market. The current study analyzes risk premiums and risk-adjusted excess returns of a portfolio of the mos...This paper examines the role of innovation in firm performance by drawing empirical evidence from the capital market. The current study analyzes risk premiums and risk-adjusted excess returns of a portfolio of the most innovative firms in the US from 2006 to 2010. The results show that average risk premiums of an equal-weighted portfolio of the most innovative finns in the US are economically larger than the CRSP2 value-weighted index risk premiums four years in a row from 2006 to 2009 and are economically greater than the standard and poor （S＆P） 500 index risk premiums from 2006 to 2010. The portfolio exhibits average statistically significant and positive risk-adjusted excess returns for the 3-year and 5-year holding period intervals. The findings serve as evidence of the favorable role of innovation in firm performance.展开更多
It is important to determine the most appropriate levels of risk and return for small investors. For that purpose, the investment funds are very important tools to create a portfolio for small investors, to deploy the...It is important to determine the most appropriate levels of risk and return for small investors. For that purpose, the investment funds are very important tools to create a portfolio for small investors, to deploy the potential risks in optimal proportions, and to direct investors. In this study, the performance of 83 pieces of investment funds will be evaluated which are treated in Turkey dates from January 1, 2010 to December 31, 2012 with performance evaluation methods such as Sharpe, Modigliani （M2） that is based on the standard deviation, and Treynor, T2, Jensen that is based on systematic risk （beta）, and the highest and lowest performance investment funds will be presented. The aim of the study is to examine the success of the investment fund managers whether they could estimate the course of the market well or not regarding time period. The empirical results show that the investors who invest on the funds that have negative risk premium by investing in the investment funds getting under the risk cannot get more excess return than getting the return from the risk-free interest rate as treasury bills. The result implies that it could be said that the systematic and total risks of all investment funds are low and they are not sensitive to the developments in the market, and thus, regarding funds could be called as conservative funds.展开更多
This paper studies incomplete stock market that includes discontinuous price processes. The discontinuity is modeled by very general point processes admitting only stochastic intensities. Prices are driven by jump-dif...This paper studies incomplete stock market that includes discontinuous price processes. The discontinuity is modeled by very general point processes admitting only stochastic intensities. Prices are driven by jump-diffusion uncertainty and have random but predictable jumps. The space of risk-neutral measures that are associated with the market is identified and related to fictitious completions. The construction of replicating portfolios is discussed, and convex duality methods are used to prove existence of optimal consumption and investment policies for a problem of utility maximization.展开更多
文摘中国联通已经和韩国的 SK 电讯携手合作:国内大型汽车制造厂中或多或少都会找到外资的背景管理规范的餐饮公司几乎都有外资的影子,甚至是直接引进国外著名品牌,如“麦当劳”和“星期五”。如果把中外合资比作“结婚”,上面的这些是已经成婚的。还有更多的中外企业在谈“恋爱”,比如百威啤酒和青岛啤酒、葛兰素史克和重庆太极。当然也有不少合资公司正在“打离婚”,或者已经“分居”,比如惠而浦和上海水仙、雀巢和青岛乳业。
基金Supported by the National Science Foundatin of China (No.79670 0 64)
文摘Instead of existing methods,a recurrent neural network is conceived to deal with three stages of portfolio management.Mainly,a deterministic annealing neural network is proposed for the approach to portfolio problem,which is a kind of quadratic programming.Finally,through a real example,we verify that the neural network model proposed in this paper is a good tool to solve the portfolio problem.
文摘Portfolio selection is one of the major capital allocation and budgeting issues in financial management, and a variety of models have been presented for optimal selection. Semi-variance is usually considered as a risk factor in drawing up an efficient frontier and the optimal portfolio. Since semi-variance offers a better estimation of the actual risk portfolio, it was used as a measure to approximate the risk of investment in this work. The optimal portfolio selection is one of the non-deterministic polynomial(NP)-hard problems that have not been presented in an exact algorithm, which can solve this problem in a polynomial time. Meta-heuristic algorithms are usually used to solve such problems. A novel hybrid harmony search and artificial bee colony algorithm and its application were introduced in order to draw efficient frontier portfolios. Computational results show that this algorithm is more successful than the harmony search method and genetic algorithm. In addition, it is more accurate in finding optimal solutions at all levels of risk and return.
文摘In this paper, a tractable solution is proposed to integrate, to a certain extent, market liquidity risk in the portfolio selection process. It is shown how an investor may take advantage of this additional risk source within the standard mean-variance optimization framework, by in certain circumstances overcoming the pitfalls of illiquidity and in others seizing a liquidity premium. Bid prices appear effective to capture liquidity risk. The efficient frontier conceived with bid prices consists of mean-variance optimal allocations that cover more liquid stocks （large caps） under stressed market conditions and less liquid stocks （small caps） under normal conditions.
文摘This paper examines the role of innovation in firm performance by drawing empirical evidence from the capital market. The current study analyzes risk premiums and risk-adjusted excess returns of a portfolio of the most innovative firms in the US from 2006 to 2010. The results show that average risk premiums of an equal-weighted portfolio of the most innovative finns in the US are economically larger than the CRSP2 value-weighted index risk premiums four years in a row from 2006 to 2009 and are economically greater than the standard and poor （S＆P） 500 index risk premiums from 2006 to 2010. The portfolio exhibits average statistically significant and positive risk-adjusted excess returns for the 3-year and 5-year holding period intervals. The findings serve as evidence of the favorable role of innovation in firm performance.
文摘It is important to determine the most appropriate levels of risk and return for small investors. For that purpose, the investment funds are very important tools to create a portfolio for small investors, to deploy the potential risks in optimal proportions, and to direct investors. In this study, the performance of 83 pieces of investment funds will be evaluated which are treated in Turkey dates from January 1, 2010 to December 31, 2012 with performance evaluation methods such as Sharpe, Modigliani （M2） that is based on the standard deviation, and Treynor, T2, Jensen that is based on systematic risk （beta）, and the highest and lowest performance investment funds will be presented. The aim of the study is to examine the success of the investment fund managers whether they could estimate the course of the market well or not regarding time period. The empirical results show that the investors who invest on the funds that have negative risk premium by investing in the investment funds getting under the risk cannot get more excess return than getting the return from the risk-free interest rate as treasury bills. The result implies that it could be said that the systematic and total risks of all investment funds are low and they are not sensitive to the developments in the market, and thus, regarding funds could be called as conservative funds.
基金This research is partially supported by NSF under DMI-9908294 and DMI-0196084.
文摘This paper studies incomplete stock market that includes discontinuous price processes. The discontinuity is modeled by very general point processes admitting only stochastic intensities. Prices are driven by jump-diffusion uncertainty and have random but predictable jumps. The space of risk-neutral measures that are associated with the market is identified and related to fictitious completions. The construction of replicating portfolios is discussed, and convex duality methods are used to prove existence of optimal consumption and investment policies for a problem of utility maximization.
