121,347 research outputs found

    Trust in social machines: the challenges

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    The World Wide Web has ushered in a new generation of applications constructively linking people and computers to create what have been called ‘social machines.’ The ‘components’ of these machines are people and technologies. It has long been recognised that for people to participate in social machines, they have to trust the processes. However, the notions of trust often used tend to be imported from agent-based computing, and may be too formal, objective and selective to describe human trust accurately. This paper applies a theory of human trust to social machines research, and sets out some of the challenges to system designers

    A Dual Characterization of Incentive Efficiency

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    We show that incentive e cient allocations in economies with adverse se- lection and moral hazard can be determined as optimal solutions to a linear programming problem and we use duality theory to obtain a complete charac- terization of the optima. Our dual analysis identi es welfare e ects associated with the incentives of the agents to truthfully reveal their private information. Because these welfare e ects may generate non-convexities, incentive e cient allocations may involve randomization. Other properties of incentive e cient allocations are also derived

    Engaging Older Youth: Program and City-Level Strategies to Support Sustained Participation in Out-of-School Time

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    With support from The Wallace Foundation, the Harvard Family Research Project and P/PV conducted a study of almost 200 out-of-school-time (OST) programs in six cities to better understand how they promote sustained participation among older youth.The resulting data indicated that two of the most important practices distinguishing high-retention programs were: ample leadership opportunities for youth and high levels of staff efforts to keep informed about participants' lives outside the programs. The study also compares and contrasts effective practices for middle school- versus high school-aged youth, noting the shortcomings of "one-size-fits-all" strategies. Finally, Engaging Older Youth details the influence of city-level OST initiatives on programs and identifies the types of city-level services that likely support participation

    Potential Competitive Effects of Vertical Mergers: A How-To Guide for Practitioners

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    The purpose of this short article is to aid practitioners in analyzing the competitive effects of vertical and complementary product mergers. It is also intended to assist the agencies if and when they undertake revision of the 1984 U.S. Vertical Merger Guidelines. Those Guidelines are out of date and do not reflect current enforcement or economic thinking about the potential competitive effects of vertical mergers. Nor do they provide the tools needed to carry out a modern competitive effects analysis. This article is intended to partially fill the gap by summarizing the various potential competitive harms and benefits that can occur in vertical mergers and the types of economic and factual analysis of competitive effects that can be applied to those mergers during the HSR review process. The analysis in the article also identifies several legal and policy issues that the agencies would consider when they undertake the process of revising the Vertical Merger Guidelines. The Appendix contains a listing and summary of the vertical merger cases challenged by the DOJ and FTC since 1994

    An Abstract Formal Basis for Digital Crowds

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    Crowdsourcing, together with its related approaches, has become very popular in recent years. All crowdsourcing processes involve the participation of a digital crowd, a large number of people that access a single Internet platform or shared service. In this paper we explore the possibility of applying formal methods, typically used for the verification of software and hardware systems, in analysing the behaviour of a digital crowd. More precisely, we provide a formal description language for specifying digital crowds. We represent digital crowds in which the agents do not directly communicate with each other. We further show how this specification can provide the basis for sophisticated formal methods, in particular formal verification.Comment: 32 pages, 4 figure

    European Research Area (ERA) from the Innovation Perspective: Knowledge Spillovers, Cost of Inventing and Voluntary Cooperation

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    The paper analyses the European Research Area policy (ERA) from the innovation perspective. The Lisbon Treaty gives the Union the objective of free circulation of researchers, scientific knowledge and technology. The five ERA initiatives implement the ERA policy on the basis of voluntary cooperation. The ERA and innovation are linked through the business sector R&D investment. The economic value of the ERA comes from accelerated cross-European knowledge spillovers reducing the cost of inventing. In general, important obstacles hinder the knowledge spillovers making them largely intra-national. These obstacles arise due to the incentives in providing and sharing knowledge and to costs of capturing knowledge spillovers. Funding of knowledge from national budgets and uncertain benefits from knowledge circulation across the heterogenous member states complicates situation further. The analysis of Joint Programming and Better Careers and Mobility initiatives reveals multiple sources of obstacles to cross-European knowledge spillovers. Weak incentives in the member states and limited possibilities at the EU level block the implementation of ERA. In this constellation, the ERA initiatives need to support openness and competition in publicly funded research and universities as well as better models of scientific management to guarantee highest scientific quality. Accelerated (ERA) knowledge spillovers require extended and dynamic markets.European Research Area (ERA), knowledge spillovers, innovation, incentives, voluntary cooperation

    Incentive compatibility and pricing under moral hazard

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    We study a simple insurance economy with moral hazard, in which random contracts overcome the non-convexities generated by the incentive-compatibility constraints. The novelty is that we use linear programming and duality theory to study the relation between incentive compatibility and pricing. Using linear programming has the advantage that we can impose the incentive-compatibility constraints on the agents that are uninformed (the insurance firms). In contrast, most of the general equilibrium literature imposes them on the informed agents (the consumers). We derive the two welfare theorems, establish the existence of a competitive equilibrium, and characterize the equilibrium prices and allocations. Our competitive equilibrium has two key properties: (i) the equilibrium prices reflect all the relevant information, including the welfare costs arising from the incentive-compatibility constraints; (ii) the equilibrium allocations are the same as when the incentive-compatibility constraints are imposed on the consumers

    Assessing DFID's Results in Water, Sanitation and Hygiene: An Impact Review

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    Over the 2011 to 2015 period, the UK government set itself the goal of providing 60 million people with clean water, improved sanitation or hygiene promotion interventions (a type of development assistance known collectively as WASH). In 2015 it reported that it had exceeded this target, reaching 62.9 million people. We conducted an impact review of DFID's WASH portfolio to identify whether its results claims were credible, and to explore whether programmes were doing all they could to maximise impact and value for money. The review concluded that UK aid has made a significant contribution to improving WASH access in low-income countries, and that its claim of reaching 62.9 million people is based on sound evidence. However, the review highlighted sustainability as an area of particular concern, with not enough being done to ensure that improved WASH access was becoming a permanent part of people's lives. It concluded that DFID needs to do more to address long-term problems like water security, maintenance of infrastructure, strengthening local institutions so they can manage services, and changing behaviour. It also found improvements are needed to ensure value for money – with a stronger focus on lifetime investment costs – and to target vulnerable people as well as hard-to-reach communities, in line with the Global Goals commitment to 'leave no one behind'. The review gave DFID a 'Green-Amber' rating, recognising the impressive results, but also underscoring the need to better maximise the impact and sustainability of UK aid in this important sector

    Trauma Informed Community Building Evaluation: A Formative Evaluation of the TICB Model and its Implementation in Potrero Hill

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    This formative evaluation of the TICB model and its implementation in the PTA public housing community was conducted between September 2014 and July 2015 by an evaluation team from the HOPE SF Learning Center. This evaluation was designed to support the further development of the TICB model as well as inform efforts to implement the model in Potrero Terrace and Annex and other communities. This evaluation seeks to examine the implementation and impact of the TICB model at PTA in order to: * Understand the impact of ongoing TICB-informed programming through analysis of outputs and outcomes prioritized by stakeholder partners [see Appendix A]. * Identify facilitators and barriers to implementation of the TICB model in community-building work within PTA and the surrounding Potrero Hill neighborhood. * Inform BRIDGE Housing's work to improve programming, and guide future program priorities and structures. * Generate information to better understand the impact of the financial investment in helping to build community with and between public housing residents and residents of the surrounding neighborhood. * Assess implications for replicability/reproducibility at other public housing communities, including the additional HOPE SF sites, and beyond
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