( incentive structure ) and how to execute regulation ? ( organization structure ) my research indicates , securities market is a market with strong asymmetric information and externalities , which constitutes the most basic reason for external regulation . while to construct a fair trading environment and to provide sufficient protections for investors are also the needs of justice and ethics 研究表明，证券市场具有强烈的信息不对称性和外部性，这是对证券市场进行外部监管的最基本的经济理论基础，而建立一个公平的交易环境、对投资者提供更为全面的保护则是证券市场监管在正义和伦理方面的要求。
This article analyses the transaction environment of network governance in hightech smes from four perspectives : the uncertainty of demand , the complexity of task , the special purpose of human assets , and transaction frequency , and concludes that , compared with traditional enterprise network , the network in hightech smes is characterized by dynamic change 本文从需求不确定性、任务复杂性、人力资产专用性与交易频率等四个方面对中小高技术企业网络治理的交易环境进行了分析，认为与传统企业网络相比较，中小高技术企业网络具有动态变迁特征。
On the basis of some conceptions relating to ec security such as encrpytion techniques and identity - authentication , we mainly discuss the disadvantages of using ssl in online payment . to solve these disadvantages of ssl , i try to add bilateral - identity - authentication to give the customs more equitable circumstance to do ec businesses . for the reason of confronting the hacking , the management of cryptogram must to be improved 针对这些不足，作者尝试在ssl协议的基础上，添加双向身份认证，保证客户获得和商家平等的交易环境，同时对密钥的管理进行了改进，限制了同一密钥的生存周期，使得密文拥有更高的随机性，以对抗中间人黑客的监听和破解。
