Business and Economics Journal

In this paper, we study the retention and investment strategy in a time-inconsistent model for optimal decision problem under stochastic differential game framework. The investment portfolio includes multi-risky assets, whose returns are assumed to be correlated in a time-varying manner and change cyclically. The claim losses of insurance companies and investment are also assumed to be correlated with each other. Extended HJBI equations result in a solution to the portion of retention and an optimal portfolio with equally weighted allocations of risky assets, which is demonstrated first time theoretically. An optimal control bound is proposed for monitoring and predicting the optimal wealth level. The proposed model is expected to be effective in making decision for investment and reinsurance strategies, controlling, and predicting optimal wealth under uncertain environment. In particular, the model can be applied easily in the case of very high dimensional investment portfolio.

The Korean Stock Exchange (KRX) is among the most rapidly growing markets in the world, and the Korean KOSPI 200 stock index option is among the most traded options contract. Not surprisingly, the KRX and related derivatives products have been attracting significant interest from investors and researchers alike. The KRX offers an excellent opportunity to examine the effects of individual investors. Most of the trading on the KRX is done by individuals as opposed to institutions. This paper examines behavioral tendencies of traders of the KOSPI 200 option contract. Findings show the KOPSI 200 index options contract is often mispriced and that the mispricing occurs most often after extreme downturns in the KRX. Traders exhibit cognitive recency biases, strong preferences for skewness, and often overreact to changes in the KRX spot market.

The main purpose of the study is to assess the determinants of procurement performance at Arba Minch University. In this study, the researcher tries to see the correlation between the independent variable (management style, organizational culture, Information Technology (IT) adaption, staff competency, stockholders commitment and records management) and dependent variable (performance of procurement with appropriate time, price, and quantity, quality, source, budget consumption, and contract management). The study assessed theoretical, empirical, and conceptual review of related literature. The research design was descriptive (frequency and percentage) and explanatory design (Pearson product-moment correlation and multiple linear regressions) analysis with the help of SPSS 20.0 software packages was used and also used mixed approaches (quantitative and qualitative research approach). The finding was assessed procurement performance strongly affected management style, staff competency, organization culture, stockholders commitment, IT adoption, and records management. The data gathering tools were primary and secondary data which were questioner and focus group discussion from 210 respondents using self-administered questionnaire and 57 interviewers and the final response rate was 90.16%. The correlation result (0.75) shows there is a strong correlation between the outcome variable and the predictor variable. The regression result (r2 =0.63) also shows predictor variables explain public procurement performance and except ICT adaption all predictor variables significant and high impact on performance and the reaming factors which account 0.36 which were unexplored variable affect procurement performance. The finding revealed that procurement performance was strongly affected by management style, staff competency, organization culture, stockholders' commitment, IT adoption, and records management. And the result of the finding shows in AMU there were to some extant problems in management style, staff competency, organization culture, stockholders' commitment, IT adoption, and records management which lead to less performance in public procurement.