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Planners
Kinds of Planners Selected AbstractsMaking the Leap from Researcher to Planner: Lessons from Avian Conservation Planning in the Dominican RepublicCONSERVATION BIOLOGY, Issue 1 2000Steven C. Latta Published accounts of national, multidisciplinary planning efforts and priority setting for avian conservation are not common. I describe the process and results of a broad-based, grassroots-oriented avian conservation planning workshop held in the Dominican Republic in which we designed a coordinated strategy for avian conservation in the country. The planning process sought to (1) increase communication and cooperation among conservationists; (2) familiarize participants with resources pertinent to avian conservation; (3) encourage the transfer of information between researchers and managers; (4) promote the concepts of long-term avian monitoring, avian conservation plans, and species management plans; and (5) develop a common, multidisciplinary strategy to promote the conservation of birds in the Dominican Republic. The workshop highlighted group discussions among research biologists, managers, educators, and public policy specialists to assess avian conservation needs and priorities with respect to each discipline and has since galvanized a significant portion of the conservation community around several cooperative projects involving diverse segments of the community. Avian biologists can play a significant role in conservation efforts through a willingness to work with key players in diverse fields and to envision holistic, multidisciplinary approaches to conservation issues. Resumen: Cuando los biologícos investigadores incursionan en la biología de la conservación enfrentan nuevos desafíos, especialmente en países extranjeros, al intentar prestar apoyo para esfuerzos de planificación de la conservación. Los informes publicados de esfuerzos de planificación nacional, multidisciplinaria y de establecimiento de prioridades para la conservación de aves no son comunes. Describo el proceso y los resultados de un taller nacional de planificación para conservación de aves en la República Dominicana que utilizaba un proceso fundamental de base amplia donde creamos una estrategia coordinada para la conservación de aves del país. El proceso de planeación buscaba (1) aumentar comunicación y cooperación entre conservacionistas, (2) familiarizar a los participantes con los recursos disponibles para la conservación de aves, (3) estimular la transferencia de información entre investigadores y manejadores, (4) promover los conceptos del monitoreo de aves a largo plazo, planes de conservación de especies y planes de manejo de especies y (5) desarrollar una estrategia multidisciplinaria común para promover la conservación de aves en la República Dominicana. El taller puso a relieve discusiones de grupo entre investigadores, manejadores, educadores y especialistas en política pública para evaluar las necesidaes y prioridades para la conservación de aves con respecto a cada disciplina, desde entonces se ha estimulado a una porción significativa de la comunidad conservacionista alrededor de proyectos de cooperación que involucran a diversos segmentos de la comunidad. Los ornitólogos pueden jugar un papel significativo en los esfuerzos de conservación mediante una buena disposición para trabajar con personas clave en diversas disciplinas y visualizar de una manera integral y multidisciplinaria las estrategias para abordar asuntos de conservación. [source] Migration and welfare: a very simple modelJOURNAL OF INTERNATIONAL DEVELOPMENT, Issue 7 2007Roberto Cellini Abstract The paper presents a very simple model of migration, relying on three widely accepted points: first, labour productivity and wages in a country depend on the present average human capital; second, agents maximise their utility, so that migration decisions depend on the wage gap across economies; third, the larger the personal human capital, the higher the propensity is to migrate (ceteris paribus). The model shows that migration through its external effects always lowers the welfare in the sending country, while the effects on the receiving country can be positive or negative. As a consequence, selfish developed economies could desire a larger migration than the optimal level for a benevolent World Planner. This calls for international coordination concerning the regulation of migration flows. Copyright © 2007 John Wiley & Sons, Ltd. [source] ICC Conference and Workshop Planner 2009,2012QUALITY ASSURANCE & SAFETY OF CROPS & FOOD, Issue 2 2009Article first published online: 19 MAY 200 No abstract is available for this article. [source] From plan to practice: Implementing watershed-based strategies into local, state, and federal policy,ENVIRONMENTAL TOXICOLOGY & CHEMISTRY, Issue 4 2000Alice L. Jones Abstract Planners are becoming increasingly interested in watershed-based plans as a way to more accurately reflect the natural landscape processes that cross the borders of political jurisdictions. Although developing plans that cross political boundaries is a relatively simple matter, establishing the transboundary authority necessary to implement such plans is often a much different matter. We investigated the regulatory mechanisms under which a watershed-based storm-water management plan could be implemented in the Big Darby Creek, Ohio, USA, a national scenic river currently facing critical threats from nonpoint sediment- and pollutant-loaded storm-water runoff in the rapidly urbanizing portions of the watershed. The watershed encompasses portions of 7 counties, 11 incorporated areas, and 26 townships, each of which has some authority over land use and storm water. The transboundary options explored include creation of a storm-water utility, creating a conservancy district, or an independent approach requiring all jurisdictions in the watershed to simultaneously adopt a series of storm-water ordinances. We evaluated these options on a number of characteristics, including their relative ability to control runoff quality and quantity, the locus of political control and enforcement authority under each, funding considerations, and the likelihood of acceptance given the region's existing political realities. Although a central authority such as a conservancy district or storm-water management district would likely be most effective in protecting water quality, the long tradition of local controls on land use makes this politically infeasible. Thus, we argue that a watershed-based protection plan for the Darby region will require the simultaneous independent approach. The case study of the Big Darby suggests that the successful implementation of watershed-based plans may be more dependent on the plan's political savvy than its technical superiority. [source] Applying Prochaska's model of change to needs assessment, programme planning and outcome measurementJOURNAL OF EVALUATION IN CLINICAL PRACTICE, Issue 4 2001Kathryn Parker MA Abstract A major goal of continuing medical education (CME) is to enhance the performance of the learner. In order to accomplish this goal, careful consideration and expertise must be applied to the three primary ingredients of CME planning: assessing learner needs, programme design and outcome measurement. Traditional methods used to address these three components seldom result in CME initiatives that change performance, even in the presence of sophisticated CME formats and capable learners. In part, performance may not change because the learner is not ,ready to change'. Planners of CME are aware of this concept but have been unable to measure ,readiness to change' or employ it in assessing learner needs, and planning and evaluating CME. One theory that focuses on an individual's readiness to change is Prochaska's model, which postulates that change is a gradual process proceeding through specific stages, each of which has key characteristics. This paper examines the applicability of this model to all components of CME planning. To illustrate the importance of this model, this paper provides examples of these three components conducted both with and without implementation of this model. [source] Using Technology to Teach Health: A Collaborative Pilot Project in AlabamaJOURNAL OF SCHOOL HEALTH, Issue 10 2002Brian F. Geiger ABSTRACT: The Centers for Disease Control and Prevention (CDC) identified six adolescent risk behaviors that contribute to chronic diseases and disorders, including poor dietary habits, sedentary lifestyle, and abuse of alcohol, tobacco, and other drugs. This project pilot-tested a "train-the-trainer" model to diffuse an interactive health education software program into Alabama middle schools during a school year. Developmentally appropriate content included nutrition, physical activity, and prevention of substance use. Twenty-four site facilitators selected from 18 public school systems trained 364 colleagues and 2,249 students to use the software. During a school year, facilitators created 150 student assignments; they reported increased interest among students in health instruction. An essential feature of the project involved an active partnership among the funder, state department of education, university, and public schools. Planners provided technical assistance through face-to-face interaction, distance learning, telephone and e-mail communications, and a Web site. Planners and facilitators worked together to overcome barriers to the use of technology for health instruction. [source] Adaptive Management and Watersheds: A Social Science Perspective,JOURNAL OF THE AMERICAN WATER RESOURCES ASSOCIATION, Issue 1 2008Catherine Allan Abstract: Adaptive management is often proposed as the most effective way to manage complex watersheds. However, our experience suggests that social and institutional factors constrain the search for, and integration of, the genuine learning that defines adaptive management. Drawing on our work as social scientists, and on a guided panel discussion at a recent AWRA conference, we suggest that watershed-scale adaptive management must be recognized as a radical departure from established ways of managing natural resources if it is to achieve its promise. Successful implementation will require new ways of thinking about management, new organizational structures and new implementation processes and tools. Adaptive management encourages scrutiny of prevailing social and organizational norms and this is unlikely to occur without a change in the culture of natural resource management and research. Planners and managers require educational, administrative, and political support as they seek to understand and implement adaptive management. Learning and reflection must be valued and rewarded, and fora established where learning through adaptive management can be shared and explored. The creation of new institutions, including educational curricula, organizational policies and practices, and professional norms and beliefs, will require support from within bureaucracies and from politicians. For adaptive management to be effective researchers and managers alike must work together at the watershed-scale to bridge the gaps between theory and practice, and between social and technical understandings of watersheds and the people who occupy and use them. [source] Making Place in BangaloreARCHITECTURAL DESIGN, Issue 5 2005Anooradha Iyer Siddiqi Abstract In the city of Bangalore in southern India, the predominant architectural language is that of conventional global commerce. ,Bland high-rise developments' jostle with shanties and urban sprawl. Anooradha Iyer Siddiqi, AIA, explores an alternative way, by Shilpa Sindoor Architects and Planners. The practice invests in a sense of place, but also uses a knowledge of the local construction market and materials to its economic advantage. Copyright © 2005 John Wiley & Sons, Ltd. [source] A hybrid approach for simulating human motion in constrained environmentsCOMPUTER ANIMATION AND VIRTUAL WORLDS (PREV: JNL OF VISUALISATION & COMPUTER ANIMATION), Issue 3-4 2010Jia Pan Abstract We present a new algorithm to generate plausible motions for high-DOF human-like articulated figures in constrained environments with multiple obstacles. Our approach is general and makes no assumptions about the articulated model or the environment. The algorithm combines hierarchical model decomposition with sample-based planning to efficiently compute a collision-free path in tight spaces. Furthermore, we use path perturbation and replanning techniques to satisfy the kinematic and dynamic constraints on the motion. In order to generate realistic human-like motion, we present a new motion blending algorithm that refines the path computed by the planner with motion capture data to compute a smooth and plausible trajectory. We demonstrate the results of generating motion corresponding to placing or lifting object, walking, and bending for a 38-DOF articulated model. Copyright © 2010 John Wiley & Sons, Ltd. [source] Tactics-Based Behavioural Planning for Goal-Driven Rigid Body ControlCOMPUTER GRAPHICS FORUM, Issue 8 2009Stefan Zickler Computer Graphics [I.3.7]: Animation-Artificial Intelligence; [I.2.8]: Plan execution, formation, and generation; Computer Graphics [I.3.5]: Physically based modelling Abstract Controlling rigid body dynamic simulations can pose a difficult challenge when constraints exist on the bodies' goal states and the sequence of intermediate states in the resulting animation. Manually adjusting individual rigid body control actions (forces and torques) can become a very labour-intensive and non-trivial task, especially if the domain includes a large number of bodies or if it requires complicated chains of inter-body collisions to achieve the desired goal state. Furthermore, there are some interactive applications that rely on rigid body models where no control guidance by a human animator can be offered at runtime, such as video games. In this work, we present techniques to automatically generate intelligent control actions for rigid body simulations. We introduce sampling-based motion planning methods that allow us to model goal-driven behaviour through the use of non-deterministic,Tactics,that consist of intelligent, sampling-based control-blocks, called,Skills. We introduce and compare two variations of a Tactics-driven planning algorithm, namely behavioural Kinodynamic Rapidly Exploring Random Trees (BK-RRT) and Behavioural Kinodynamic Balanced Growth Trees (BK-BGT). We show how our planner can be applied to automatically compute the control sequences for challenging physics-based domains and that is scalable to solve control problems involving several hundred interacting bodies, each carrying unique goal constraints. [source] Adjusting life for quality or disability: stylistic difference or substantial dispute?,HEALTH ECONOMICS, Issue 11 2009Mara Airoldi Abstract This paper focuses on the contrast between describing the benefit of a healthcare intervention as gain in health (QALY-type ideas) or a disability reduction (DALY-type ideas). The background is an apparent convergence in practice of the work conducted under both traditions. In the light of these methodological developments, we contrast a health planner who wants to maximise health and one who wants to minimise disability. To isolate the effect of framing the problem from a health or a disability perspective, we do not use age-weighting in calculating DALY and employ a common discounting methodology and the same set of quality of life weights. We find that interventions will be ranked in a systematically different way. The difference, however, is not determined by the use of a health or a disability perspective but by the use of life expectancy tables to determine the years of life lost. We show that this feature of the DALY method is problematic and we suggest its dismissal in favour of a fixed reference age rendering the use of a health or a disability perspective merely stylistic. Copyright © 2008 John Wiley & Sons, Ltd. [source] A comparative simulation study of work processes in autonomous production cellsHUMAN FACTORS AND ERGONOMICS IN MANUFACTURING & SERVICE INDUSTRIES, Issue 1 2002Christopher Schlick An approach to human-centered design and assessment of work processes in flexible manufacturing systems with the help of dynamic task networks is presented. To model and simulate the task networks, the method of timed colored Petri Nets is used. Two task networks are developed. The first task network is a model of work processes in Autonomous Production Cells (APCs). The second task network represents work processes in conventional Computer Numerically Controlled (CNC)-based manufacturing systems. The material processing technology is associated with 5-axis milling. The values of attributes of task elements were acquired empirically on a fine-grained level with reference to a sample milling order. Comparative hypotheses regarding time-on-task, supervisory control functions, levels of cognitive control, human error (HE), and labor division were then formulated. To test these hypotheses, several simulation experiments were conducted. The results from inferential statistics show that single-operator APCs have a 30% higher efficiency in relation to total time-on-task. Moreover, the level of cognitive control is significantly shifted toward rule- and knowledge-based behavior. Surprisingly, the simulation of minor HE does not demonstrate a significantly worse performance from APCs. A simulated labor division among central process planner and production operator allows an additional efficiency improvement of approximately 15%. However, the labor division has two important drawbacks: first, a sequential incompleteness of operators' task spectrum occurs; second, the operator has to cope with hierarchical task incompleteness. Finally, a sensitivity analysis was carried out to investigate the effects of varying lot sizes and number of processed orders. © 2002 John Wiley & Sons, Inc. [source] The Optimal Timing of Procurement Decisions and Patent Allocations,INTERNATIONAL ECONOMIC REVIEW, Issue 4 2002Motty Perry In a patent race, social incentives and private incentives may sometimes coincide and at other times diverge , too many researchers remain in the race. If the social planner cannot determine what stage the researchers have achieved, this informational constraint can result in a socially suboptimal outcome. We construct a mechanism in which a planner exploits the researchers' private information to determine when and to whom to allocate rights to pursue the final prize. This mechanism does not require any payments and, therefore, will not distort earlier investment incentives. It is solvable by the iterative elimination of dominated strategies. [source] Business-to-business electronic marketplaces: Joining a public or creating a privateINTERNATIONAL JOURNAL OF FINANCE & ECONOMICS, Issue 2 2004Chrysovalantou Milliou Abstract We analyse a firm's incentives to create a private B2B e-marketplace or to join a public e-marketplace. In the former the firm incurs higher set-up costs but lower quality investment costs due to closer supplier,buyer collaboration than in the public. In the latter, the firm's quality improvement may spillover to competitors. We show that a firm's incentives to create a private e-marketplace are stronger, the closer is supplier,buyer collaboration, the higher are spillovers, and the larger is the buyer's profit share within the e-marketplace. Our welfare analysis indicates that a firm's incentives do not always coincide with those of a social planner. Copyright © 2004 John Wiley & Sons, Ltd. [source] A Bayesian regression approach to terrain mapping and an application to legged robot locomotionJOURNAL OF FIELD ROBOTICS (FORMERLY JOURNAL OF ROBOTIC SYSTEMS), Issue 10 2009Christian Plagemann We deal with the problem of learning probabilistic models of terrain surfaces from sparse and noisy elevation measurements. The key idea is to formalize this as a regression problem and to derive a solution based on nonstationary Gaussian processes. We describe how to achieve a sparse approximation of the model, which makes the model applicable to real-world data sets. The main benefits of our model are that (1) it does not require a discretization of space, (2) it also provides the uncertainty for its predictions, and (3) it adapts its covariance function to the observed data, allowing more accurate inference of terrain elevation at points that have not been observed directly. As a second contribution, we describe how a legged robot equipped with a laser range finder can utilize the developed terrain model to plan and execute a path over rough terrain. We show how a motion planner can use the learned terrain model to plan a path to a goal location, using a terrain-specific cost model to accept or reject candidate footholds. To the best of our knowledge, this was the first legged robotics system to autonomously sense, plan, and traverse a terrain surface of the given complexity. © 2009 Wiley Periodicals, Inc. [source] Global planning on the Mars Exploration Rovers: Software integration and surface testingJOURNAL OF FIELD ROBOTICS (FORMERLY JOURNAL OF ROBOTIC SYSTEMS), Issue 4 2009Joseph Carsten In January 2004, NASA's twin Mars Exploration Rovers (MERs), Spirit and Opportunity, began searching the surface of Mars for evidence of past water activity. To localize and approach scientifically interesting targets, the rovers employ an onboard navigation system. Given the latency in sending commands from Earth to the Martian rovers (and in receiving return data), a high level of navigational autonomy is desirable. Autonomous navigation with hazard avoidance (AutoNav) is currently performed using a local path planner called GESTALT (grid-based estimation of surface traversability applied to local terrain) that incorporates terrain and obstacle information generated from stereo cameras. GESTALT works well at guiding the rovers around narrow and isolated hazards; however, it is susceptible to failure when clusters of closely spaced, nontraversable rocks form extended obstacles. In May 2005, a new technology task was initiated at the Jet Propulsion Laboratory to address this limitation. Specifically, a version of the Field D* global path planner was integrated into MER flight software, enabling simultaneous local and global planning during AutoNav. A revised version of AutoNav was then uploaded to the rovers during the summer of 2006. In this paper we describe how this integration of global planning into the MER flight software was performed and provide results from both the MER surface system test bed rover and five fully autonomous runs by Opportunity on Mars. © 2009 Wiley Periodicals, Inc. [source] A perception-driven autonomous urban vehicleJOURNAL OF FIELD ROBOTICS (FORMERLY JOURNAL OF ROBOTIC SYSTEMS), Issue 10 2008John Leonard This paper describes the architecture and implementation of an autonomous passenger vehicle designed to navigate using locally perceived information in preference to potentially inaccurate or incomplete map data. The vehicle architecture was designed to handle the original DARPA Urban Challenge requirements of perceiving and navigating a road network with segments defined by sparse waypoints. The vehicle implementation includes many heterogeneous sensors with significant communications and computation bandwidth to capture and process high-resolution, high-rate sensor data. The output of the comprehensive environmental sensing subsystem is fed into a kinodynamic motion planning algorithm to generate all vehicle motion. The requirements of driving in lanes, three-point turns, parking, and maneuvering through obstacle fields are all generated with a unified planner. A key aspect of the planner is its use of closed-loop simulation in a rapidly exploring randomized trees algorithm, which can randomly explore the space while efficiently generating smooth trajectories in a dynamic and uncertain environment. The overall system was realized through the creation of a powerful new suite of software tools for message passing, logging, and visualization. These innovations provide a strong platform for future research in autonomous driving in global positioning system,denied and highly dynamic environments with poor a priori information. © 2008 Wiley Periodicals, Inc. [source] Decisional autonomy of planetary roversJOURNAL OF FIELD ROBOTICS (FORMERLY JOURNAL OF ROBOTIC SYSTEMS), Issue 7 2007Félix Ingrand To achieve the ever increasing demand for science return, planetary exploration rovers require more autonomy to successfully perform their missions. Indeed, the communication delays are such that teleoperation is unrealistic. Although the current rovers (such as MER) demonstrate a limited navigation autonomy, and mostly rely on ground mission planning, the next generation (e.g., NASA Mars Science Laboratory and ESA Exomars) will have to regularly achieve long range autonomous navigation tasks. However, fully autonomous long range navigation in partially known planetary-like terrains is still an open challenge for robotics. Navigating hundreds of meters without any human intervention requires the robot to be able to build adequate representations of its environment, to plan and execute trajectories according to the kind of terrain traversed, to control its motions, and to localize itself as it moves. All these activities have to be planned, scheduled, and performed according to the rover context, and controlled so that the mission is correctly fulfilled. To achieve these objectives, we have developed a temporal planner and an execution controller, which exhibit plan repair and replanning capabilities. The planner is in charge of producing plans composed of actions for navigation, science activities (moving and operating instruments), communication with Earth and with an orbiter or a lander, while managing resources (power, memory, etc.) and respecting temporal constraints (communication visibility windows, rendezvous, etc.). High level actions also need to be refined and their execution temporally and logically controlled. Finally, in such critical applications, we believe it is important to deploy a component that protects the system against dangerous or even fatal situations resulting from unexpected interactions between subsystems (e.g., move the robot while the robot arm is unstowed) and/or software components (e.g., take and store a picture in a buffer while the previous one is still being processed). In this article we review the aforementioned capabilities, which have been developed, tested, and evaluated on board our rovers (Lama and Dala). After an overview of the architecture design principle adopted, we summarize the perception, localization, and motion generation functions required by autonomous navigation, and their integration and concurrent operation in a global architecture. We then detail the decisional components: a high level temporal planner that produces the robot activity plan on board, and temporal and procedural execution controllers. We show how some failures or execution delays are being taken care of with online local repair, or replanning. © 2007 Wiley Periodicals, Inc. [source] Online robotic experiments for tele-education at the university of pisaJOURNAL OF FIELD ROBOTICS (FORMERLY JOURNAL OF ROBOTIC SYSTEMS), Issue 4 2005A. Bicchi In this paper we describe work being done at our department to make the robotics laboratory accessible to students and colleagues to execute and watch real-time experiments at any time and from anywhere. We describe a few different installations and highlight the underlying philosophy, which is aimed at enlarging the lab in all the dimensions of space, time, and available resources, through the use of Internet technologies. In particular, four experimental setups with hardware and software architecture description are presented: the dc motor, the magnetic levitator, the nonholomonic motion planner (NHMP), and the graphic environment tool. © 2005 Wiley Periodicals, Inc. [source] Using OXSIM for path planningJOURNAL OF FIELD ROBOTICS (FORMERLY JOURNAL OF ROBOTIC SYSTEMS), Issue 8 2001Stephen Cameron We address the issue of building scalable and reusable path planners for realistic robot manipulators working in three-dimensional space amid complex geometry, by presenting the latest version of our robot manipulator planning toolbox, OxSIM. OxSIM is designed to greatly simplify the building of planners by providing core competence in three-dimensional geometry. This is done by the provision of efficient routines for computing the distance between parts of the robot and its environment. A new version of OXSIM, written in C++, provides an object-oriented interface to the basic system, which increases its ease of use. Here we give an overview of OxSIM and how it works and describe a modified version of the probabilistic road map planner that we have implemented under the framework. © 2001 John Wiley & Sons, Inc. [source] Doing Wonders with an Egg: Optimal Re-distribution When Households Differ in Market and Non-Market AbilitiesJOURNAL OF PUBLIC ECONOMIC THEORY, Issue 3 2003Alessandro Balestrino The paper studies non-linear income taxation and linear commodity taxation in a household production context with households differentiated by market and non-market ability. In such a setting, there is an efficiency motive for re-distribution which is independent from the usual equity motive, and operates also when the social planner is indifferent to utility inequality. As a consequence, some of the policy prescriptions applicable to the case in which households differ in market ability only do not hold when households differ also in non-market ability. For instance, re-distribution is not necessarily from high- to low-wage households, and it is not necessarily true that the marginal rate of income tax should be zero for high incomes and positive for low incomes. In some cases, re-distribution may accentuate rather than lessen utility inequality, and can reverse the direction of income inequality relative to the laissez-faire equilibrium. Furthermore, contrary to Atkinson-Stiglitz, it may be optimal to use indirect and direct taxation simultaneously even when the utility function is separable in commodities and labour. [source] AGGLOMERATION VERSUS PRODUCT VARIETY: IMPLICATIONS FOR REGIONAL INEQUALITIES,JOURNAL OF REGIONAL SCIENCE, Issue 5 2006Kristian Behrens ABSTRACT We investigate how cross-country differences in firms' fixed set-up costs affect the trade-off between global efficiency and spatial equity. Our analysis reveals that the standard assumption of symmetry in set-up costs masks the existence of an interesting effect: the range of available varieties depends on the spatial distribution of firms. In such a setting, where the market outcome leads to excessive agglomeration in the symmetric case, a planner may opt for asymmetric set-up costs and even more agglomeration. We show that the planner will always favor lower set-up costs in the large country with more agglomeration when the consumer's marginal preference for variety is high, or with less agglomeration when the consumer's marginal preference for variety is low. [source] DURABILITY CHOICE AND THE PIRACY FOR PROFIT OF GOODSMETROECONOMICA, Issue 2 2010Article first published online: 26 MAR 200, Gregory E. Goering ABSTRACT We explore the impact of durable goods piracy in a simple two-period durability choice setting where an originator faces a future for-profit pirate that clones or duplicates copies of the durable good. We find that a social planner, as well as a monopoly originator, may well engage in a sort of ,reversed planned obsolescence'. In other words, they manufacture a product that is more durable than the first-best cost-minimizing level, if they cannot directly control the pirate. We show this occurs even in rental or committed sales settings, indicating Swan's market independence result does not hold here. [source] CAPITALISTS, WORKERS AND SOCIAL SECURITYMETROECONOMICA, Issue 2 2007Thomas R. Michl ABSTRACT This paper elaborates an exogenous growth model that nests overlapping generations of workers who save for life cycle reasons with dynastic agents who save for bequest reasons (,capitalists'). The model overcomes Marglin's objection that the overlapping generations framework requires special assumptions about technology, and it also provides a natural environment to revisit Samuelson's analysis of lump-sum transfers between generations. The ability of a benevolent planner to improve workers' welfare is severely restricted by the control capitalists exercise over the accumulation process. Prefunding social security assumes renewed significance because it overcomes this restriction. [source] The Office of CommunicationsPRESIDENTIAL STUDIES QUARTERLY, Issue 4 2001MARTHA JOYNT KUMAR The Office of Communications is front and center in the White House effort to publicize the president and his policies. The importance of presidential communications can be seen in the manner in which the topic drives the agenda of daily staff meetings, the size of the commitment to it of White House and administration resources and people, and the way the function has insinuated itself into the operations of almost every White House office. While most White House offices are defined by the functions that come with the unit, the communications director's position is defined by his or her relationships with officials working inside and outside of the White House, including the president, the chief of staff, the press secretary, and officials in departments and agencies. There are three basic models for communications directors as they manage their operations: advocate with the press, strategist and planner, and events coordinator. At its minimum, the job entails events management, but its larger role is defining the message and strategic plan of a presidency. [source] When consensus choice dominates individualism: Jensen's inequality and collective decisions under uncertaintyQUANTITATIVE ECONOMICS, Issue 1 2010Charles F. Manski D7; D81; H42 Research on collective provision of private goods has focused on distributional considerations. This paper studies a class of problems of decision under uncertainty in which an efficiency argument for collective choice emerges from the mathematics of aggregating individual payoffs. Consider decision making when each member of a population has the same objective function, which depends on an unknown state of nature. If agents knew the state of nature, they would make the same decision. However, they may have different beliefs or may use different decision criteria to cope with their incomplete knowledge. Hence, they may choose different actions even though they share the same objective. Let the set of feasible actions be convex and the objective function be concave in actions, for all states of nature. Then Jensen's inequality implies that consensus choice of the mean privately chosen action yields a larger mean payoff than does individualistic decision making, in all states of nature. If payoffs are transferable, the mean payoff from consensus choice may be allocated to Pareto dominate individualistic decision making. I develop these ideas. I also use Jensen's inequality to show that a planner with the power to assign actions to the members of the population should not diversify. Finally, I give a version of the collective-choice result that holds with consensus choice of the median rather than mean action. [source] R&D investment decision and optimal subsidyR & D MANAGEMENT, Issue 2 2001Jyh-bang Jou This article assumes that a firm facing technological uncertainty must decide whether to purchase R&D capital at each instant. R&D capital exhibits both irreversibility and externality through the learning-by-doing effect. The combination of irreversibility and uncertainty drives agents to be more prudent; the maxim ,better safe than sorry' applies. This maxim is more important if uncertainty is greater, technology progresses at a lower pace, the externality is stronger, or a catastrophic event is less likely to occur. A firm ignoring the externality will both invest later and disinvest earlier than a social planner who internalizes the externality. An equal rate of investment tax credits should be given to both costlessly reversible investments and irreversible ones, and the same rate of taxation should be imposed on disinvestment. [source] Optimal Commodity Taxes in AustraliaTHE AUSTRALIAN ECONOMIC REVIEW, Issue 1 2002Paul Blacklow The recent changes to commodity taxes in Australia have led to renewed interest in a classic question in public finance: should the tax rates be uniform or differentiated? This article attempts to answer this question by calculating optimal commodity taxes in Australia for a nine-item disaggregation. The estimates point to non-uniform commodity taxes, even from the viewpoint of an inequality-insensitive tax planner. The optimal commodity taxes bear little resemblance with the pre-GST or post-GST tax rates. No less significant is our observation that even the purely efficiency-driven optimal commodity taxes imply lower real expenditure inequality than the actual taxes. [source] Implementation of the Socially Optimal OutcomeTHE MANCHESTER SCHOOL, Issue 5 2004Chun-Hsiung Liao We show that a welfare maximizing planner in a Cournot oligopoly can easily implement the socially optimal outcome by offering the firms a per unit subsidy in return for upfront fees. The planner announces a subsidy and auctions it off to a limited number of firms. It is shown that if at least one firm is excluded and not subsidized, the socially optimal outcome can be achieved while the planner runs no deficit. The planner does not impose any regulation on the firms. They accept his offer willingly and voluntarily. Yet, every firm makes zero net profit and consumers extract the entire surplus. [source] Markets, torts, and social inefficiencyTHE RAND JOURNAL OF ECONOMICS, Issue 2 2006Andrew F. Daughety We provide a model wherein oligopolists produce differentiated products that also have a safety attribute. Consumption of these products may lead to harm (to consumers and/or third parties), lawsuits, and compensation, either via settlement or trial. Firm-level costs reflect both safety investment and production activities, as well as liability-related costs. Compensation is incomplete, both because of inefficiencies in the bargaining process and (possibly) because of statutorily established limits on awards. We compare the market equilibrium safety effort and output levels to what a planner who is able to set safety standards, but takes the market equilibrium output as given, would choose. [source] | ||||||||||||||||||||||||||||