Stockholm School of Economics

About: Stockholm School of Economics is a education organization based out in Stockholm, Sweden. It is known for research contribution in the topics: Population & Cost effectiveness. The organization has 1186 authors who have published 4891 publications receiving 285543 citations. The organization is also known as: Stockholm Business School & Handelshögskolan i Stockholm.

Stepping into the internet: new ventures in virtual worlds

Abstract: When the call for papers for this special issue went out in the fall of 2007, there was a lot of hype around virtual worlds, with organizations such as Toyota, American Apparel, IBM, Reuters, Sun Microsystems, and Wells Fargo experimenting with Second Life as a potential platform to reach consumers. Anshe Chung was touted as the first online personality to exceed one million U.S. dollars from profits earned inside a virtual world. However, in accordance with Gartner’s hype cycle, after the initial spike in hype in 2006, virtual worlds quickly entered into the phase Gartner refers to as the “trough of disillusionment.” As enticing as the initial press reports were around the potential of virtual worlds for creating new forms of value, during the disillusionment phase individuals and organizations discovered what we have long known in MIS: if you build it, they will not necessarily come.

Rapid and Near Real-Time Assessments of Population Displacement Using Mobile Phone Data Following Disasters: The 2015 Nepal Earthquake.

Abstract: INTRODUCTION: Sudden impact disasters often result in the displacement of large numbers of people. These movements can occur prior to events, due to early warning messages, or take place post-event due to damages to shelters and livelihoods as well as a result of long-term reconstruction efforts. Displaced populations are especially vulnerable and often in need of support. However, timely and accurate data on the numbers and destinations of displaced populations are extremely challenging to collect across temporal and spatial scales, especially in the aftermath of disasters. Mobile phone call detail records were shown to be a valid data source for estimates of population movements after the 2010 Haiti earthquake, but their potential to provide near real-time ongoing measurements of population displacements immediately after a natural disaster has not been demonstrated. METHODS: A computational architecture and analytical capacity were rapidly deployed within nine days of the Nepal earthquake of 25th April 2015, to provide spatiotemporally detailed estimates of population displacements from call detail records based on movements of 12 million de-identified mobile phones users. RESULTS: Analysis shows the evolution of population mobility patterns after the earthquake and the patterns of return to affected areas, at a high level of detail. Particularly notable is the movement of an estimated 390,000 people above normal from the Kathmandu valley after the earthquake, with most people moving to surrounding areas and the highly-populated areas in the central southern area of Nepal. DISCUSSION: This analysis provides an unprecedented level of information about human movement after a natural disaster, provided within a very short timeframe after the earthquake occurred. The patterns revealed using this method are almost impossible to find through other methods, and are of great interest to humanitarian agencies. Language: en

Equilibrium Selection in the Repeated Prisoner's Dilemma: Axiomatic Approach and Experimental Evidence

Abstract: We propose an axiomatic approach for equilibrium selection in the discounted, infinitely repeated symmetric Prisoner's Dilemma. Our axioms characterize a unique selection criterion that is also useful as a tool for applied comparative statics exercises as it results in a critical discount factor 6* strictly larger than 6, the standard criterion that has often been used in applications. In an experimental test we find a strong predictive power of our proposed criterion. For parameter changes where the standard and our criterion predict differently, changes in observed cooperation follow predictions based on 8' [JEL C72, C73, C92, D81) which conditions do people cooperate? In this article we study this question in the context of the infinitely repeated Prisoner's Dilemma. Progress in this topic is important for game theory itself, but is also critical for the numerous applications of infinitely repeated games in economics, sociology, political science, biology, and other disciplines. We propose an axiomatic approach that formulates (i) a minimal set of simple and intuitive conditions on the model primitives a sensible selection theory should satisfy and (ii) a more comprehensive set of conditions resulting in a unique cooperation criterion. While the parsimonious formulation (i) has implications for the qualitative question whether cooperation should increase or decrease when parameters change the more specific model (ii) based on a longer list of axioms comes up with a quantified parameter-frontier above which it predicts cooperation. An axiomatic approach can only convince with simple and intuitive axioms that build only on model primitives. The first part of the paper builds intuition for the novel axioms and derives their theoretical implications. The second part presents results from a laboratory experiment testing the implications from both the parsimonious (i) and comprehensive (ii) versions of the theory.