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This thesis studies the expansion of the scope of economics to the study of phenomena traditionally considered to lie outside of the domain of economics. We claim that such a development came with the expansion of the domain of government intervention from the late 1940s on, which raised interdisciplinary questions. What was considered to be "economic", "social" or "political" phenomena evolved and blurred. In return, this stimulated economists to overstep the traditional disciplinary boundaries. We identify three steps in the expansion of the scope of economics. First, in the context of the Cold War society, economists progressively studied political phenomena such as the problem of collective choice. Second, in the 1960s, and more precisely during Lyndon Johnson's presidency, economists became progressively interested in the study of social problems related to the notion of poverty, such as discrimination, education, crime or public health. Finally, in the 1970s, the last step of the development of the scope of economics was characterized by the progressive fading of any a priori disciplinary boundaries. Vindicated by the success of their economic approach to political and social phenomena, some economists argued that their discipline was not defined by its field of analysis, but rather by its tools. ; Cette thèse explore l'élargissement du champ d'analyse de la science économique hors de ses frontières traditionnelles, vers l'étude de phénomènes aussi divers que la discrimination, le comportement politique ou encore les comportements familiaux. Nous soutenons qu'une telle évolution s'accompagna de l'élargissement du domaine d'intervention de l'Etat aux Etats-Unis à partir de la deuxième moitié des années 1940, qui stimula l'émergence de questions « aux frontières » des sciences sociales. Ainsi, la perception de ce qui relève de l'économique, du social ou du politique s'en trouva brouillée. En retour, ces évolutions favorisèrent le franchissement des barrières disciplinaires par les économistes. Nous identifions trois étapes distinctes dans l'évolution du champ d'analyse de la science économique. Premièrement, dans un contexte marqué par la Guerre Froide, les économistes s'intéressèrent aux questions relevant du domaine traditionnel de la science politique, telles que celles du choix collectif. Deuxièmement, a partir du début des années 1960, mais surtout durant le mandat de Lyndon Johnson, les économistes s'intéressèrent progressivement à l'étude des problèmes sociaux en lien avec la notion de pauvreté, tels que la discrimination, l'éducation, le crime ou encore la santé. Enfin, dans les années 1970, le dernier stade de l'évolution des frontières de la science économique fut marqué par la disparition progressive de barrières thématiques a priori. Forts du succès de leurs analyses du politique et du social, certains économistes défendirent l'idée que leur discipline n'était plus définie par un domaine d'analyse, mais par ses outils.

International audience ; This article studies the few works James Buchanan wrote on education from the end of the 1950s to the early 1970s. These neglected works tell us important things about how Buchanan's ideas on constitutions evolved through time, because they provided Buchanan with the opportunity to apply his ideas about constitutions and, in return, nurture his theoretical thinking. Two historical developments were of importance in the evolution of Buchanan's thinking: the Southern reactions to the Supreme Court's injunction to desegregate public schools in the late 1950s, and, in the late 1960s, university unrest. We argue that Buchanan moved from a rather optimistic conception that constitutions complement market mechanisms, and constitutional manipulation can be tolerated if market mechanisms were sufficiently important to nonetheless let individuals do what they want, to a really pessimistic view – a constitution is absolutely necessary to control and even coerce behaviors. Behind these claims stands Buchanan's conception of what is a " good society " and of the role of the economist in its defense.

International audience ; This article studies the few works James Buchanan wrote on education from the end of the 1950s to the early 1970s. These neglected works tell us important things about how Buchanan's ideas on constitutions evolved through time, because they provided Buchanan with the opportunity to apply his ideas about constitutions and, in return, nurture his theoretical thinking. Two historical developments were of importance in the evolution of Buchanan's thinking: the Southern reactions to the Supreme Court's injunction to desegregate public schools in the late 1950s, and, in the late 1960s, university unrest. We argue that Buchanan moved from a rather optimistic conception that constitutions complement market mechanisms, and constitutional manipulation can be tolerated if market mechanisms were sufficiently important to nonetheless let individuals do what they want, to a really pessimistic view – a constitution is absolutely necessary to control and even coerce behaviors. Behind these claims stands Buchanan's conception of what is a " good society " and of the role of the economist in its defense.

International audience ; This article studies the few works James Buchanan wrote on education from the end of the 1950s to the early 1970s. These neglected works tell us important things about how Buchanan's ideas on constitutions evolved through time, because they provided Buchanan with the opportunity to apply his ideas about constitutions and, in return, nurture his theoretical thinking. Two historical developments were of importance in the evolution of Buchanan's thinking: the Southern reactions to the Supreme Court's injunction to desegregate public schools in the late 1950s, and, in the late 1960s, university unrest. We argue that Buchanan moved from a rather optimistic conception that constitutions complement market mechanisms, and constitutional manipulation can be tolerated if market mechanisms were sufficiently important to nonetheless let individuals do what they want, to a really pessimistic view – a constitution is absolutely necessary to control and even coerce behaviors. Behind these claims stands Buchanan's conception of what is a " good society " and of the role of the economist in its defense.

This essay analyzes what Gary S. Becker and Richard A. Posner have written for various media (either in print or online) that are not strictly aimed at academic audiences. We provide an historical account of how they became interested in such activities, from their first attempts, made independently from each other, to their joint venture on the Internet through The Becker-Posner Blog. In our description of their independent and then collaborative experiences, differences appear between Becker and Posner about how to be a public intellectual, but also similarities as to what that means and implies. From this perspective, the blog proves to be a further and crucial step in their career as public intellectuals. Both Becker and Posner use the blog for the freedom and flexibility it offers. They use it to develop a sort of "casual economic thinking" that they push farther than in any of their other writings, even as public intellectuals.

This article analyses 12 cases of investigative journalism in Sub-Saharan Africa. The reporters all claimed to have contributed to change processes by influencing government policy, action by state administration, supporting the uptake of scientific solutions or provoking public debate. An assessment of these processes shows that in 10 cases, the journalists indeed helped to trigger change and in two cases they failed to do so. The cases are evaluated through an explorative approach inspired by the dynamic models for communication on public issues developed by Rucht and Peters. Different types of investigative stories in Sub-Saharan Africa are identified and hypotheses are developed on key factors that were important in investigating and publishing the stories as well as in achieving change. A decisive element of investigative journalism in Sub-Saharan Africa seems to be the involvement of and the interaction with other societal non-journalist actors.

Whether preparing us for economic recovery after the zombie apocalypse, analyzing vampire investment strategies, or illuminating the market forces that affect vampire-human romances, Economics of the Undead: Zombies, Vampires, and the Dismal Science gives both seasoned economists and layman readers something to sink their teeth into.