Agent Based Models of Competition and Collaboration

Swarm intelligence is a popular paradigm for algorithm design. Frequently drawing inspiration from natural systems, it assigns simple rules to a set of agents with the aim that, through local interactions, they collectively solve some global problem. Current variants of a popular swarm based optimization algorithm, particle swarm optimization (PSO), are investigated with a focus on premature convergence. A novel variant, dispersive PSO, is proposed to address this problem and is shown to lead to increased robustness and performance compared to current PSO algorithms. A nature inspired decentralised multi-agent algorithm is proposed to solve a constrained problem of distributed task allocation. Agents must collect and process the mail batches, without global knowledge of their environment or communication between agents. New rules for specialisation are proposed and are shown to exhibit improved eciency and exibility compared to existing ones. These new rules are compared with a market based approach to agent control. The eciency (average number of tasks performed), the exibility (ability to react to changes in the environment), and the sensitivity to load (ability to cope with differing demands) are investigated in both static and dynamic environments. A hybrid algorithm combining both approaches, is shown to exhibit improved eciency and robustness. Evolutionary algorithms are employed, both to optimize parameters and to allow the various rules to evolve and compete. We also observe extinction and speciation. In order to interpret algorithm performance we analyse the causes of eciency loss, derive theoretical upper bounds for the eciency, as well as a complete theoretical description of a non-trivial case, and compare these with the experimental results. Motivated by this work we introduce agent "memory" (the possibility for agents to develop preferences for certain cities) and show that not only does it lead to emergent cooperation between agents, but also to a signicant increase in efficiency.

An empirical investigation of price competition and industry specialisation in NHS audit services

The NHS audit market is regulated by the Audit Commission (AC) and has unique features. We develop a model for audit fees that includes rigorous analysis of the type of auditor. Poor financial standing does not give rise to higher audit fees. Despite regulation the study supports the existence of a Big Five price premium on the audit fee, but only one firm has a premium. We found no premium due to industry specialisation. The removal of performance audit from AC regulation will require improved audit fee reporting and control.

Who gains from whom? Spillovers, competition and technology sourcing in the foreign-owned sector of UK manufacturing

There is a growing literature explaining foreign direct investment flows in terms of 'technology sourcing', whereby multinational firms invest in certain locations not to exploit their firm-specific assets in the host environment, but to access technology that is generated by host country firms. However, it is far from clear whether the literature has found significant evidence of such activity beyond a few isolated examples. This paper extends this work by allowing for the possibility of multinational enterprises (MNEs) sourcing technology not only from host country firms but also from each other within a host economy. The paper demonstrates that MNEs in the UK do indeed appropriate spillovers both from indigenous firms and from other foreign investors, but that there are also significant competition effects that act to reduce productivity in certain industries. The paper also explores which countries' affiliates gain most from technology sourcing in the UK, and which generate the greatest spillovers within the foreign-owned sector. © Scottish Economic Society 2005.

Organizational capital, product market competition and technical efficiency in Italian cooperatives

This paper tries to identify under which conditions increasing market competition may help cooperatives to improve technical efficiency to guarantee positive profits. This hypothesis is first formalized in a partial equilibrium framework and then is tested on a sample of Italian conventional and cooperative firms, using frontier analysis. Technical efficiency indexes are computed by using the one-stage approach as suggested by Battese and Coelli (1995), where proxies for competition are introduced as determinants of efficiency, along with other exogenous factors accounting for the firms’ heterogeneity. However, the overall impact of increasing competition on efficiency is negative.

Retail competition and consumer choice:contextualising the “food deserts” debate

The “food deserts” debate can be enriched by setting the particular circumstances of food deserts – areas of very limited consumer choice – within a wider context of changing retail provision in other areas. This paper’s combined focus on retail competition and consumer choice shifts the emphasis from changing patterns of retail provision towards a more qualitative understanding of how “choice” is actually experienced by consumers at the local level “on the ground”. This argument has critical implications for current policy debates where the emphasis on monopolies and mergers at the national level needs to be brought together with the planning and regulation of retail provision at the local, neighbourhood level.

The relationship between intergroup competition and longitudinal change in group effectiveness

Presentation of an abstract

The organisation of innovation: collaboration, cooperation and multifunctional groups in UK and German manufacturing

Marked differences exist between the institutional and social context for innovation in the UK and Germany. The question addressed here is how these different contexts affect the objectives and organisation of innovation in UK and German manufacturing. In particular, the paper examines the extent to which UK and German plants engage in inter-plant collaboration and cooperation and multifunctional working as part of their innovative activity, and explores the reasons for differences in these patterns of involvement. The investigation is based on a large-scale, comparative survey of manufacturing plants in the two countries. In Germany, institutional and social norms are found to encourage collaborative inter-plant innovation, but aspects of the German skills training and industrial relations systems make the adoption of more flexible internal systems more difficult. In the UK, by contrast, the more adversarial nature of inter-firm relations makes it more difficult to establish external collaborations based on mutual trust, but less restrictive labour market structures make it easier for UK plants to adopt multifunctional working. This is linked to differences in attitudes to the property rights and transaction cost problems inherent in innovation.

A pragmatic approach for engineering porous mannitol and mechanistic evaluation of particle performance

The importance of mannitol has increased recently as an emerging diluent for orodispersible dosage forms. The study aims to prepare spray dried mannitol retaining high porosity and mechanical strength for the development of orally disintegrating tablets (ODTs). Aqueous feed of d-mannitol (10% w/v) comprising ammonium bicarbonate, NH4HCO3 (5% w/v) as pore former was spray dried at inlet temperature of 110-170°C. Compacts were prepared at 151MPa and characterized for porosity, hardness and disintegration time. Particle morphology and drying mechanisms were studied using thermal (HSM, DSC and TGA) and polymorphic (XRD) methods. Tablet porosity increased from 0.20±0.002 for pure mannitol to 0.53±0.03 using fabricated porous mannitol. Disintegration time dropped by 50-77% from 135±5.29s for pure mannitol to 75.33±2.52-31.67±1.53s for mannitol 110-170°C. Hardness increased by 150% at 110°C (258.67±28.89N) and 30% at 150°C (152.70±10.58N) compared to pure mannitol tablets (104.17±1.70N). Increasing inlet temperature resulted in reducing tablet hardness due to generation of 'micro-sponge'-like particles exhibiting significant elastic recovery. Impact of mannitol polymorphism on plasticity/elasticity cannot be ruled out as a mixture of α and β polymorphs formed upon spray drying.

Towards conflict or cooperation? The Ukraine crisis and EU-Russia relations

The Ukraine crisis and Russia’s contribution to it have raised numerous concerns regarding the possible emergence of a new ‘Cold War’ in Europe. At the same time, Ukraine’s popular choice and enthusiasm for European integration expressed clearly on the streets of Kyiv seem to have caused Russia to adopt a (neo)revisionist attitude. In this context, relations between Russia and the EU (and the West for that matter) have been limited, frozen and directed on path towards conflict. This article analyses how the traditional dichotomy between conflict and cooperation in EU–Russia relations was replaced by conflict in the context of the Ukraine crisis. The article contends that the breakdown of the symbolic and peaceful cohabitation between the EU and Russia has been influenced by the fact that both actors have chosen to ignore key tensions that characterized their post-Cold War interactions. The article identifies three such tensions: the first emphasizes divisions between EU member states and their impact on coagulating a common EU approach towards Russia; the second (geopolitical) tension highlights the almost mutually exclusive way in which the EU and Russia’s security interests have developed in the post-Soviet space; finally, the third contends that a clash of values and worldviews between the EU and Russia makes conflict virtually unavoidable.