Social networks,mass media and public opinions

Our opinions and ideas are shaped by what our friends said and what we read or watched on mass media. In this paper, we propose a concise and analyzable model to study the effects of mass media modeled as an applied external field, and social networks on public opinions based on the multi-state voter model, and a tuned parameter can control the relative intensity of the effects of mass media and social networks. We consider a generalized scenario where there exist committed or stubborn agents in the networks whose opinions are not affected by their friends or mass media. We find that the fraction of each opinion will converge to a value which only relates to the fractions and degrees of stubborn agents, and the relative intensity between media and network effects. The final agents with media opinion, except the stubborn agents, also include the increment produced by the internal impact of social networks and that caused by the external impact of media. Interestingly the second increment is composed of two parts, one is from the media effect when there are no interactions between agents and the other is from the influence of media on agent opinions caused by social network structure. That is the interactions among agents within social networks can amplify media influence. Finally we also discuss several extensions to the dynamics model which consider more realistic scenarios.     

A processual analysis of the purchasing and supply organization in transition: the impact of offshoring

Many companies have resorted to offshoring in order to reduce costs and grow their global market presence. Yet it remains unclear what impact the offshoring strategy has on the purchasing and supply organization (PSO) of these companies. In this paper the nature and type of changes offshoring organizations make within the PSO are examined, i.e. how new purchasing and supply management (PSM) structures and practices emerge, are maintained or are discarded as production operations are relocated. The processual perspective is used to analyze empirical data from a rich, in-depth case study within a global engineering company. Results suggest that in line with the law of requisite variety the PSO changes thoroughly when the company relocates its production activities through the captive offshoring mode, but does so in a more disjointed and non-linear manner than the current stage models would suggest. The offshoring process provides momentum for PSO change and influences where and how the change happens. We present five propositions for further research and conclude that offshoring provides managers with opportunities to: (i) change and influence the strategic direction of PSM in their organizations, and (ii) build viable strategies of retaining and managing knowledge and PSM competencies in global operations.