Social networks provide a convenient place for people to interact; members in social networks may create new connections or break existing connections, driving the evolution of complex network structure. Dynamics in social networks, such as opinion formation and spreading dynamics, may result in complex collective phenomena. This paper conducts a survey on 495 students from six schools in Shaanxi, Henan, and Zhejiang provinces and discusses the impact of self-presentation on adolescent network altruistic behaviors, the intermediary role of social ability cognition, and the moderating role of privacy awareness. The results show the following: (1) Self-presentation in social networks can positively predict adolescent network altruistic behaviors. The positive prediction effect of network sharing is the largest, and the positive prediction effect of network support is the least. (2) Social ability cognition plays an intermediary role between self-presentation and adolescent network altruistic behaviors. (3) The moderating effect of privacy awareness is not significant.

China is still facing the double challenges of over nutrition and malnutrition. One of the main reasons is the lack of residents’ understanding of the nutritional value of food. Quantified self, as a measure of consumer self-activity, has been used to analyze food consumption behavior recently. Although the research results are increasing, the conclusions are not consistent. What’s more, previous literatures did not consider food consumption behavior based on the theory of information perception and the risk perception theory. In addition to obtaining information through their own human capital for quantitative activities, consumers will also obtain information through social networks. In view of the above understanding, this study uses experimental design and field survey to obtain data, uses Heckman two-step method and PLS path modeling method to analyze the impact of consumers’ quantified self-behavior on their health food consumption, and discusses the moderating role of social networks based on the perspective of complex network. The results show that (1) consumers’ health awareness can promote their choice of quantified self-behavior, (2) consumers’ quantified self-behavior is helpful to promote their purchase intention and purchase scale of healthy food, and (3) social networks play a positive moderating role in consumers’ quantified self-influence on their healthy food consumption. Both emotional networks and instrumental networks have significant moderating effect, but the formal is stronger. This article not only considers the relationship between food consumption behavior and social network but also the enhances literature based on the theory of information perception and the risk perception theory.

Taking into account the three-sector general equilibrium perspective of the government, business, and household sectors and taking government public goods investment as intermediary; this article builds mathematical models of local governmental competition and three-sector consumption. It also theoretically analyzes the impacting path of local governmental competition, causing increased investment in public goods, thereby reducing consumption. At the same time, based on the model of China's provincial panel data from 1993 to 2015, the empirical analysis shows that a 1% increase in the level of competition among local governments will result in a corresponding decrease of 0.757% in total consumption, 0.348% in governmental competition, 0.340% in business consumption and 0.366% in household consumption. Local governmental competition leads to the government's tendency to invest in public goods and reduces the regional consumption, which especially damages the consumption capacity of the household sector.

With the arrival of knowledge economy, "talent" is playing an increasingly important role. The success of an enterprise, especially an e-commerce enterprise, largely depends on its ability and motivation of continuous innovation, which is mainly achieved by various talents in the enterprise. However, it has also become a problem for enterprises whether the highly educated talents will form the learning effect needed in social practice and business operation. The solution is to explore and prove the study on the impact of the academic structure of employees based on the learning effect on the business performance of e-commerce enterprises. At present, there is a lack of theoretical research on this aspect. Therefore, based on the perspective of learning effect, this paper attempts to open the study on the impact of employee education composition on the business performance of ecommerce enterprises, and puts forward some Suggestions for the management practice of enterprises.

Abstract-Coordinating the conflict of time between study and working is a common problem for many people who are employed by a company. Especially for those who want to be released from regular work for study for a long time. They may have to enter into contracts with various agencies and if their circumstances change, they could potentially find themselves in breach of contract and may have to reconsider their options. In this paper, we consider a scenario where a doctoral student found himself in such a predicament. Two models were built to help the subject to make his decision, which are a quantitative model built by TreeAge Pro and a qualitative model built by DEXi.