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Guided by H.M.M. Markowitz portfolio theory, this paper postulates that the security market permits or prohibit short sale. Then based on the bi-objective of the maximal return at minimal risk, this paper sets up the investment utility function through linear weighted sums method, and makes first derivation about the function by method of Lagrange multiplier and determines the vector of investment...
Traditional wises think inter-firm network as instrument for lowering or diversifying risk, which is questioned by recent studies. The purpose of the paper is to investigate the role of inter-firm network in the formation of risk crisis in the background of industrial cluster. The paper puts forward an analyzing model and studies recent cases from Zhejiang Province of China. The paper suggests inter-firm...
Based on the background analysis of CDMA development, this paper focuses on its market conditions and investment value. The results show that the CDMA lost its market share and its cost return was not good enough because of it didn't fill the customers' needs. However, it pushed the telecommunications industry forward, brought the convenience to customers. And the most important thing is it brought...
This paper, based on the background analysis of how personal handy-phone system (PHS) comes into existence, compares its development from its marketability, sustainability and profitability.. The research shows that PHS is very popular among the public and it develops very fast due to its 'mobility' and low charges. With the intensifying competition and decreasing input by fixed phone operators (FPOs),...
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