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cooperationWhy Is Reciprocity So Rare in Social Animals? A Protestant AppealOne Sentence Summary: Game theoretic explanations of the evolution of cooperation in humans and other animals relies on assumptions -- rational players should never cooperate, cooperative behavior is explained by direct or diffuse reciprocity, animals can do the mental bookkeeping necessary to reciprocate with multiple partners over time -- that are not always or often borne out by data, necessitating new conceptual tools. Disciplines: Biology Cultural Evolution Economics Findings:
Keywords: tit-for-tat reputation reciprocity prisoners dilemma evolution cultural evolution cooperation altruism Published in: Genetic and Cultural Evolution of Cooperation, Peter Hammerstein, Ed., MIT Press in Cooperation with Dahlem University Press Date: 2003 One Paragraph Summary: Game theoretic explanations of cooperation involving tit-for-tat strategies and reciprocal altruism are not supported by a large body of evidence. Only a small number of animal examples have been found. Simple models of repeated games do not match the circumstances of evolutionary change. Partner switching and mobility counter the assumptions necessary for reciprocal altruism as a stable evolutionary mechanism. Reciprocity requires significant mental machinery – how do organisms determine whether the actions of others are intentionally or unintentionally cooperative or uncooperative? Alternative conceptual schemas such as partner markets – making it unprofitable for partners to switch – offer alternative conceptual schemas. Emotions may play a role in mediating complex interactions in which intentionality and reputation play a part. When Push comes To Pull: The New Economy and Culture of Networking TechnologyOne Sentence Summary: Information and communication technology innovation have begun to transform commercial business and social institutions from a "push" technology approach (hierarchical "center out"), to a "pull" technology approach (networked -based and decentralized). This poses new challenges to social, political, and educational systems that are largely designed to support "push" economies. Disciplines: Business Law History Cultural Evolution Technology Economics Political Science Sociology Findings:
Keywords: capitalism communication complexity cooperation cultural evolution group forming networks hierarchy intellectual property interdependence networks norms open source property rights reciprocity reputation social capital trust Published in: The Aspen Institute Date: 2006 One Paragraph Summary: Over the past 25+ years, change that has usually originated with technological innovation has led to new products, services, and human behavior patterns. These changes are reflected in business and industry, and the way that people entertain, govern, educate, and socialize among themselves. The change is from a centralized, command and control, bureaucratic, broadcast way of organizing, that tries to anticipate and create demand, to a decentralized and highly networked system that shares information about overall network performance and best practices among it's network, and meets local and specialized needs. One Page Summary: This paper is a summary of an Aspen Institute sponsored in-depth roundtable session, written from the perspective of one informed conference observer (Bollier). The participants are leading thinkers in the many complex areas this paper covers (economics, systems theory, human behavior, human futures, information technology evolution, etc) and are listed on page 57. A selection of their key insights shared in the paper are listed below: A "push" economy is geared towards mass production, anticipating consumer demand, and routing resources to the right place at the right time, to create standardized and mass produced products. By contrast, a "pull" economy is based on open, flexible production platforms that are used to orchestrate a broad range of resources. Instead of producing standardized products, "pull" model companies are demand-driven, and assemble products in customized ways that serve specialized or local needs, usually using "rapid" or "on the fly" processes. Several global corporations are moving towards "pull" methods, and away from "push" models; ie., Toyota, Dell, Cisco, Li & Fung. These companies employ different variations of Value Network models, that share information about overall network performance and best practices for serving specialized needs, among hundreds or even thousands of partner companies that make up the network. This creates an intra-network knowledge commons. Some companies also work closely with Open Source Software projects, thereby expanding their "pull" network, and expanding their knowledge commons into a broader Open Commons via Open Source Software project contributions. Thus, "pull" business models also tend to be Network Value-Increasing, and Commons-based business models as well. "Pull" models can also be platforms for creating "increasing returns dynamics." This is due to "pull" models being based around loose and flexible networks that are already configured to scale as growth occurs. So, growth does not incur the huge overhead costs in administration that "push" models must contend with. Pull platform key characteristics include modular and loosely-coupled networks, open channels that better harness the passion and commitment of innovation communities. "Pull" platforms also will tend to influence public policy with regards to education and innovation, as more companies tend to gravitate towards the "pull" models. The areas where "push" models tend to succeed in business are in areas where people do not know what they want, and prefer to shop from pre-made selections (Ikea, Home Depot). However, there are even "pull" models to found here, in the form of user-driven innovation, such as mountain biking, extreme skiing, hot rodding, etc. In these pro-amateur niches, customers don't necessarily know what they want, but do want to be a participant in the "pull" network that creates the product. How do you tax a product that is made in 23 different countries? "Pull" models are going to change the way that governments create policy as more companies gravitate toward them. This will influence laws about intellectual property, education, taxation and more. "Pull" economies are not just centered around finding creative ways to "outsource/offshore jobs" away from one place and to the places where "labor" is "cheaper". Successful "pull" models have encouraged and aided "insourcing", where more jobs are created, for instance in the United States by "foreign sources (a total of 7 million cited by this paper), than are out sourced (a total of 600,000+ cited by this paper). This is because pull models seek out, not just the "cheapest" labor, but the best ways to add value to the production networks. So, they can scale to many participants around the world, regardless of local labor costs, to find the best participants needed for specific specialized productions. The social dynamics of "pull" models are highly centered around creating relationships of trust, sharing knowledge, and close cooperation among network participants. In "pull" models, non-market value creation (tacit knowledge, intangible value) is generally steered towards a commons-based model. A commons is used as a "collective governance regime for managing shared resources sustainably and equitably." Many of these commons are made possible by networked information technologies (the internet). Bollier suggests that "if online commons are going to be useful to business, companies will need to do more work to develop protocols for identity and reputation management". This is because the use of the commons is based around trust. It also due to the need for ways to measure qualitative value in intangible assets beyond money, like knowledge, individual performance and value multiplication, and network wide performance/value multiplication. Roundtable participants also noted that "pull" models will pose challenges to current education regimes that are centered around training people to participate in "push" economies. One of the participants mentions that " Computers, software tools, and Internet resources make possible some radically new styles of learning. By using pull-based systems, students can function much like businesses in the pull environment: They can access resources they don't control and put themselves into flows of activity, rather than just building inventories of static, objectified "knowledge."
Towards Realistic Models for Evolution of CooperationOne Sentence Summary: The five major approaches to answering how cooperation emerges and becomes stable in nature (Group Selection, Kinship Theory, Direct Reciprocity, Indirect Reciprocity, and Social Learning) might be improved by not presuming asexual and non-overlapping generations, simultaneous-play for every interaction, dyadic interactions, mostly predetermined and mistake-free behavior, discrete actions (cooperate or defect), and the trivial role of social structure and social learning of individuals. Disciplines: Biology Cultural Evolution Sociology Findings:
Keywords: trust reputation reciprocity evolution cultural evolution cooperation competition bioeconomy altruism agent-based model Published in: MIT LCS Memorandum Date: 2002 One Paragraph Summary: Sociological and biological observations of humans and animals show that cooperation is an inherent part of human life and the life of many animals. This poses two questions: how do cooperative strategies become stable within evolution? And, how does cooperation emerge initially? Even though researchers have tried to answer these questions for at least a century, existing models do not fully explain why cooperation evolves. There are five major approaches: Group Selection, Kinship Theory, Direct Reciprocity, Indirect Reciprocity, and Social Learning. Each of these models explain only a few aspects of cooperation and might be improved by dropping some unrealistic assumptions: asexual and non-overlapping generations, simultaneous-play for every interaction, dyadic interactions, mostly predetermined and mistake-free behavior, discrete actions (cooperate or defect), and the trivial role of social structure and social learning of individuals. Theories of International RegimesOne Sentence Summary: The three schools of thought regarding international cooperation [regimes] – interest-based theories, power-based theories, and knowledge-based theories – provide numerous insights from which it is possible to draw some general findings about cooperation. Disciplines: Political Science Findings:
Keywords: cooperation Published in: Cambridge University Press Date: 1997 One Paragraph Summary: The three schools of thought regarding international cooperation [regimes] – interest-based theories, power-based theories, and knowledge-based theories – provide numerous insights from which it is possible to draw some general findings about cooperation. The basic question the authors examine is how different schools of thought analyze and explain “What accounts for the instances of rule-based cooperation in the international system?” Realism argues that cooperation is primarily imposed by the powerful, sometimes through institutions, and is primarily rational utility-maximization based on relative gains concerns. Neo-liberalism asserts that cooperation is a function of rational interests, but that institutions help players to define areas of absolute gains, or common interests. Cognitivism, or the “sociological turn,” argues that knowledge and institutions combine to create shared understandings of roles and identities that shape behavior and hinder or promote cooperation. One Page Summary: The three schools of thought regarding international cooperation [regimes] - interest-based theories, power-based theories, and knowledge-based theories - provide numerous insights from which it is possible to draw some general findings about cooperation. The basic question the authors examine is how different schools of thought analyze and explain "What accounts for the instances of rule-based cooperation in the international system?" The following table is presented by the authors (p6):
A regime exists whenever agents cooperate. Formally a regime is the "implicit or explicit principles, norms, rules, and decision-making procedures around which actors’ expectations converge." Regimes can be both formal and informal, and can include institutions as well as organizations. Interest-based Theory Interest-based theories of cooperation focus on the ability of self-interested rational agents to overcome collective action dilemmas, i.e. situations where cooperation avoids suboptimal outcomes for the cooperators. Agents are considered to be rational utility-maximizers with given preferences. Attention is given to the role of regimes/institutions in shaping preferences and facilitating cooperation. Interest-based theories note the spillover effects of cooperation (functionalism). Because of the costs of creating and maintaining institutions, establishing cooperation in one issue-area can result in solutions that can then be reused in other issue-areas. Cooperation is a result of institutional bargaining (contractualism) and results in negotiated agreements and commitments. Compliance with or defection from negotiated contractual agreements has reputational effects. There are two primary approaches to interest-based cooperation:
Situation-Structural: The situation-structural approach involves "interpreting different kinds of regimes as collective responses to the functional requirements of different kinds of collective action problems" (p 45). Models from game theory - such as Prisoner’s Dilemma, Coordination Game, and Assurance Game - are commonly used. Collaboration requires sanctions and compliance, whereas coordination merely requires agreement. Coordination - such as deciding which side of the road to drive on or allocating the frequency spectrum - is self-enforcing because participants have no incentive to defect. Also, various games have different "second order" dilemmas regarding costs of implementation and enforcement: collaboration is the most costly and the Assurance Game is the least costly. Problem-Structural: The problem-structural approach involves observing the nature of the issue-area of the problem. In this analysis there are two modes of conflict with different likelihoods of cooperation in each:
Some factors can aid in the possibility of cooperation. When agents operate under a "veil of uncertainty" regarding benefits and costs, they will often cooperate more readily because there are no known distributive issues to argue over. Exogenous shocks and public crises/outcry can spur cooperation on an issue. The key factor is that the issue-area regarding a given problem must be amenable to a contractual solution in the first place. Power-based Theories Power-based theories of cooperation focus on the importance of relative gains and security concerns to otherwise rational agents. The distribution of power and the presence of anarchy (the absence of an authority to enforce contractual obligations) are paramount. Because these concerns never change and are external to the agents involved, power-based theories are predominantly static and positivist. There are three power-based theories of international cooperation:
Hegemonic Stability Theory A hegemon is a powerful agent who provides public goods because it has the self-interest and the capacity to supply them. This provision generates free riders. According to hegemonic theory the weak exploit the strong. Hegemony can be coercive (imperialist) or benevolent (leadership). Hegemons are necessary to shoulder the costs of rulemaking and enforcement (second-order cooperation dilemmas). In return, they generally set the rules and others adjust. Mancur Olson and Duncan Snidal have noted that small groups can provide public goods by cooperating and sharing costs, instead of relying on a single hegemon. In addition, hegemons can vary according to issue-area (the environment, nuclear weapons, etc.) Power-based Research Programme According to power-based theories cooperation does not result in mutual adjustment at all but instead requires the less powerful to adjust to the more powerful. In addition, power differences shape the following:
Power-based analysis suggests that the Prisoner’s Dilemma is not the best game by which to study cooperation when power is a factor. In the Prisoner’s Dilemma there is one "best" solution and the challenge is for the various agents to arrive at it. By contrast, in Battle of the Sexes, the optimal outcome is different for each player, thus there is fundamental disagreement over what constitutes the "best" solution (mathematically there is no one best solution). As a result, cooperation and institutions merely serve the interests of the powerful. Powerful players extend their power through these means. Because differences in the distribution of costs and benefits always exist, even under conditions of absolute gains not everyone gains equally. Oran Young has questioned the reliability of assuming that structural power is translatable into bargaining power regarding outcomes. Realist Theory of Cooperation The Realist theory of cooperation attempts to explain cooperation given states’ overwhelming concern with security, independence, and autonomy. It is not merely relative gains that are a concern but a systemic intolerance for relative losses. All acts could result in the destruction of the agent, so power asymmetries trump all other concerns. In this scenario, absolute gains just do not exist. There is always the concern over "who will gain more?" The result is "defensive positionalism," or reluctant cooperation, wherein agents will cooperate only if they feel it is absolutely necessary. Rationality, in this case, is constrained by fear of destruction and the presence of anarchy. For Realists, institutions matter but only because they facilitate the necessary stabilizing exertion of power: payoffs to other agents, sanctions, and norms of reciprocity (that make accepting relative gains losses in the now or on a particular issue easier in expectation of compensation on other issues or in the future). With power, cooperation is rare at best, but without power it is impossible. Knowledge-based Theories Interest-based theories of cooperation focus on the ability of self-interested rational agents to overcome collective action dilemmas, i.e. situations where cooperation avoids suboptimal outcomes for the cooperators. Agents are considered to be rational utility-maximizers with given preferences. Attention is given to the role of regimes/institutions in shaping preferences and facilitating cooperation. Knowledge-based theories (cognitivism) focus on the way in which knowledge - and in particular inter-subjectively shared knowledge and beliefs - shape agents’ behavior and identities. Norms are of major interest to knowledge-based theories. There are two cognitivist variants:
Weak Cognitivism Weak cognitivism assumes rational actors but instead of taking preferences as given, problematizes preferences and investigates the origins of agents’ interests, as well as the impact of norms on preference formation. Weak cognitivism sees itself as complementary to other approaches. The role of knowledge is central, including ideas and learning. Because knowledge is filtered by interpretation, preferences become fluid as knowledge changes. Because knowledge is primary, knowledge-shapers are powerful influences. Epistemic communities inform policy-makers about currently accepted shared understandings, from intersubjectively held ideas to problem definitions and concerns. Thus the idea landscape acts as a "road map" from which agents choose their routes. Learning is possible and subsequent course-correction as well. Furthermore, the institutionalization of knowledge shapes agents’ preferences. Institutions contribute to consensus through knowledge and information sharing. Strong Cognitivism Strong cognitivism, on the other hand, dispenses with rational actors in favor of a sociological model of behavior. Agent’s perceptions of their own and others’ identities and roles are central objects of study. Agents are role-players, not utility maximizers. Strong cognitivism positions itself as an alternative to other approaches. This "sociological turn" investigates how knowledge and beliefs constitute agents and make possible both power and cooperation. Agents’ very identities exist only by virtue of shared understandings. Groups and institutions define who we are and what behaviors are possible and meaningful. Strong cognitivism stands in opposition to atomistic and positivist attempts to understand cooperation. Because there is no behavior without prior socialization, strong cognitivism suggests that agents act according to a "logic of appropriateness" rather than a utilitarian "logic of consequences." For strong cognitivists, sanctions and cost/benefit analysis, i.e. self-interest, is insufficient to explain cooperation. Norms both regulate behavior as well as constitute agent’s identities. This means that norms constrain but also affix meaning to certain actions. An example is a game of chess, wherein the rules must be coherent and accepted before any meaningful moves can be made. As a result, compliance is not the only indicator of cooperation. Strong cognitivists also point to the justifications used by a defecting agent as well as the response of other agents when rules and norms are violated. Generalized norms of cooperation and reciprocity create a web of meaning within which behaviors are contextualized, interpreted, and evaluated. There are four schools of thought regarding cooperation:
For strong cognitivists, neither human agency nor social structures should be given ontological priority; they share a "codetermined irreducibility." The power of legitimacy
The power of arguments
The power of identity
The power of history
Conclusion Cooperation is problematic. Whether cooperation is desirable or not, and why, as well as how it can be promoted or prevented depend on various assumption about the nature of agents and their interactions. Nonetheless, it is possible to uncover the processes that foster cooperation within each school of thought. The Toyota Group and the Aisin FireOne Sentence Summary: A flexible and coordinated response by the Toyota Group's supplier network enabled the manufacturer to rapidly restore production after a disastrous fire; the self-organized cooperation was enabled by deliberately designed practices that created dense social networks of trust and reciprocity that extended beyond Toyota's boundaries and into the companies of its network of suppliers. Disciplines: Business Economics Findings:
Keywords: social capital networks cooperation capitalism Published in: Harvard Business Review, Vol 40, No. 1, pp 49-59, Reprint 4014 Date: Fall 1998 One Paragraph Summary: Toyota Group's production system and the management practices that brought it about are legendary. When the factory that supplied a crucial component burned down in 1997, the supplier network's self-organized problem-solving made it possible to begin production of the component within two days. The coordinated and rapid response did not happen in a vacuum. Toyota did not treat suppliers as a market, pitting them against one another, and demanding price improvements when suppliers improved their own productivity; instead, Toyota brought suppliers together in informal associations, at Toyota's expense, and helped them improve productivity while allowing them to keep profits as a result of improvements – even encouraging suppliers to share their improvements with others in the network. The horizontal associations, scale-free social networks, ties of trust and reciprocity that were cultivated by these and other practices (such as encouraging ad-hoc problem-solving at all levels of the company, and bringing together employees from different parts of the company into temporary juries to solve problems) created communication channels and both catalyzed and lubricated information sharing and coordinated actions. The Quest for Meaning in Public ChoiceOne Sentence Summary: Frameworks, composed of theories that are in turn composed of varying models need to be developed to study and make predictions about the complex behaviors that take place in social situations. Disciplines: Economics Sociology Psychology Findings:
Keywords: civil society communication competition cooperation game theory group forming networks property rights public goods sharing economy Published in: American Journal of Economics and Sociology, vol. 63, issue 1, pages 105-147 Date: January 2004 One Paragraph Summary: A useful Institutional Analysis and Development (IAD) framework has evolved under the leadership of the Ostroms and their colleagues at Indiana University for over two decades. It has been applied with success in laboratory experiments on social behavior and in field studies and has enabled the creation of useful models with predictive value in diverse situations. Some results from the application of the IAD framework have lead to suggestions for effective use of common resources and norms for community decision making. The importance of effective communication and sanctioning mechanisms in effective community governance has become clear from the use of the framework. One Page Summary: The Institutional Analysis and Development (IAD) framework developed by the Ostroms and their colleagues at Indiana University provides a foundation for studying a multitude of theories, models, and predictions of public choice behaviors in different systems of governance and organization. Frameworks define the action arena to which it would be applied; the resulting patterns of interactions and outcomes, and the means of evaluating those outcomes. A framework is a general language about how varying rules, physical and material conditions, and attributes of a community affect the structure of action arenas, the incentives for actors, and resulting outcomes. Action arenas include an action situation and the actors in that situation. An action situation includes:
Actors (individual or corporate) involve:
Analysts can make strong predictions in tightly constrained situations of complete information: overuse of resources in an open commons where the actors do not share access to collective choice arenas. Results are not as clear in situations where actors are embedded in communities with norms of fairness and conservation as well as the ability to communicate with each other. Evaluation criteria can include a range of values for categories such as the following:
The IAD framework has been applied to various domains to make predictions of resulting behaviors in field settings. Examples of successful application include:
The Origins of Virtue: Human Instincts and the Evolution of CooperationOne Sentence Summary: Human emotions, customs, and institutions enable us to compete effectively with all other species by making cooperative social arrangements among ourselves – a capability that co-evolved with thumbs, speech, and tool-building. Disciplines: Biology Anthropology Cultural Evolution Findings:
Keywords: cooperation altruism emotion cultural evolution Published in: Penguin Books Date: 1998 One Paragraph Summary: Ridley asks why there is so much cooperation about if life is a competitive struggle, and why, in particular are humans such eager cooperators, and traces the evolution of cooperative arrangements for mutual benefit back to the origins of cellular life, the emergence of humans as social animals. Reciprocal altruism and group selection are offered as biological explanatory mechanisms, and the role of moralistic punishment in controlling free-riders links psychological, moral, and economic dimensions of cooperation. Human physiological and cultural capabilities for inventing and exploiting social exchanges – a willingness to cooperate and to punish those who don't, reputational mechanisms for increasing trust, moral sentiments that act as a kind of social glue – are key to the success of our species. The Logic of Collective Action: Public Goods and the Theory of GroupsOne Sentence Summary: Rational, self-interested individuals in large groups need a positive incentive or negative sanction delivered through institutional arrangements in order to provide themselves a collective good; in small groups the collective good itself can be incentive enough for individuals to cooperate. Disciplines: Economics Political Science Sociology Findings:
Keywords: cooperation group forming networks norms public goods Published in: Harvard University Press Date: 1965 One Paragraph Summary: Common or public goods are those which if consumed by one member of a group, cannot be feasibly withheld from other members. Large groups require some kind of selective sanction or incentive apart from the benefit of the public good itself for individuals to contribute their own time and resources to maintaining a formal organization. The selective aspect of sanctions or incentives indicates that institutions recognize and treat differently those who do not contribute to the public good. Organizations frequently fail to provide public goods on the most optimal scale, because all self-interested individuals try to sacrifice as little of themselves as possible to still gain access to the good. Because groups cannot benefit from fractional quantities of regulating organizations, there is also a necessary minimal cost of maintenance associated with the formation of formal organizations. The Human Web: A Bird's-eye View of World HistoryOne Sentence Summary: This synthesis of world history from the days of isolated hunter-gatherer communities to the present electronically connected cosmopolitan, interconnected world shows that all of humanity today lives in a "unitary maelstrom of cooperation and competition," and that the global spread of ideas, information, and experience "constitute[s] the overarching structure of human history." Disciplines: History Findings:
Keywords: interdependence cultural evolution cooperation competition communication civil society Published in: W.W. Norton, New York Date: 2003 One Paragraph Summary: The spread of ideas, information, and experience in ever tightening webs of interaction describes the history of the world. The inventions of bureaucratic government (to enforce defense against competing groups); alphabetic writing (to communicate at distances greater than a village or metropolis through the use of symbols); and "portable, congregational, non-local religions"(to assuage the inequalities created by the development of more complex societies by offering the promise of a better life in the hereafter and a moral code for peoples more loosely connected than they would have been in smaller, isolated villages) resulted in the creation of metropolitan webs in the earliest civilizations in Southwest Asia and Egypt, China, and what has become India and Pakistan. Connections of separate webs by traders lead to innovation diffusion, albeit at a slower pace. Disease and economic connections also resulted from these inter-web connections. Later elaborations of these developments over millennia thickened the webs of communication and increased the velocity of information leading to the rapid diffusion of innovation: while agriculture was invented in several isolated places, the steam engine only had to be developed once. The current cosmopolitan web of cooperation and competition was accelerated by the exploitation of inventions like large ships and navigation systems, moveable type, the exploitation of energy from fossil fuels, the scientific method and its association with technology developments, and more recently, electronic communication. The complexity of society has increased along with social inequalities at the same time that cheap information technologies make those inequalities evident to all creating a “combustible mix.” The Evolution of CooperationOne Sentence Summary: "The objective of this enterprise is to develop a theory of cooperation that can be used to discover what is necessary for cooperation to emerge." Disciplines: Political Science Sociology Findings:
Keywords: assurance game agent-based model communication cooperation norms prisoners dilemma reciprocity reputation security tit-for-tat trust Published in: Basic Books Date: August 1, 1985 One Paragraph Summary: Why do people (or other actors) cooperate? "The objective of this enterprise is to develop a theory of cooperation that can be used to discover what is necessary for cooperation to emerge." It uses the Prisoner's Dilemma as a framework for testing theories about balancing self-interest and competition. One Page Summary: Chapter 1, The Problem of Cooperation. Why do people (or other actors) cooperate? "The objective of this enterprise is to develop a theory of cooperation that can be used to discover what is necessary for cooperation to emerge." It uses the Prisoner's Dilemma as a framework for testing theories about balancing self-interest and competition. "In the Prisoners' Dilemma, the strategy that works best depends directly on what strategy the other player is using and, in particular, on whether this strategy leaves room for the development of mutual cooperation." Chapter 2, TIT FOR TAT. "The iterated Prisoners' Dilemma has become the E. Coli of social psychology," yet people have not paid much attention to how to play the game well. Axelrod organized a computer tournament to which people familiar with PD submitted programs encoding different strategies. The winner was one of the simplest, TIT FOR TAT. Axelrod then constructed an environment in which different programs competed, and the losing programs were eliminated: this was an ecology that rewarded high scoring programs, and punished others. "This process simulates survival of the fittest. A rule that is successful on average with the current distribution of rules in the population will become an even larger proportion of the environment of the other rules in the next generation. At first, a rule that is successful with all sorts of rules will proliferate, but later as the unsuccessful rules disappear, success requires good performance with other successful rules." In other words, the competition gets tougher. "The analysis of the tournament results indicate that there is a lot to be learned about coping in an environment of mutual power. Even expert strategists from political science, sociology, economics, psychology, and mathematics made the systematic errors of being too competitive for their own good, not being forgiving enough, and being too pessimistic about the responsiveness of the other side." The tournaments reveal that "there is a single property which distinguishes the relatively high-scoring entries from the relatively low-scoring entries. This is the property of being nice, which is to say never being the first to defect." TIT FOR TAT's rules for success:
Chapter 4, Trench Warfare. During World War I, "live and let live" arrangements emerged spontaneously between opposing units on the Western Front. Cooperation could take hold because "the same small units faced each other in immobile sectors for extended periods of time." Consequently, they had a more sustained relationship than in mobile warfare, and could develop commonly-understood rules, reciprocity and restraint in attacks, displays of strength (e.g., snipers shooting at hard targets)as well as ethics (recognition that there was an arrangement and violating it was immoral) and rituals (e.g., regular artillery firing). "Cooperation first emerged spontaneously in a variety of contexts, such as restraint in attacking the distribution of enemy rations, a pause during the first Christmas in the trenches, and a slow resumption of fighting after bad weather made sustained combat almost impossible. These restraints quickly evolved into clear patterns of mutually understood behavior, such as two-for-one or three-for-one retaliation for actions that were taken to be unacceptable." Chapter 6, How to Choose Effectively. Four suggestions about how to do well in PD:
Chapter 7, How to Promote Cooperation. Promoting cooperation can be thought of as an exercise in tinkering with the variables in a PD. "As long as the interaction is not iterated, cooperation is very difficult. That is why an important way to promote cooperation is to arrange that the same two individuals will meet each other again, be able to recognize each other from the past, and to recall how the other has behaved until now."
Chapter 8, The Social Structure of Cooperation.
Chapter 9, The Robustness of Reciprocity.
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