Col blanc (classe sociale)

A white-collar worker is a person who performs professional service, desk, managerial, or administrative work. White-collar work may be performed in an office or other administrative setting. White-collar workers include job paths related to government, consulting, academia, accountancy, business and executive management, customer support, design, economics, engineering, market research, finance, human resources, operations research, marketing, public relations, information technology, networking, law, healthcare, architecture, and research and development. In contrast: blue-collar workers perform manual labor and/or work in skilled trades; pink-collar workers work in care, health care, social work, or teaching; and grey-collar jobs combine manual labor and skilled trades with non-manual or managerial duties. The term refers to the white dress shirts of male office workers common through most of the nineteenth and twentieth centuries in Western countries, as opposed to the blue overalls worn by many manual laborers. The term "white collar" is credited to Upton Sinclair, an American writer, in relation to contemporary clerical, administrative, and management workers during the 1930s, though references to white-collar work appear as early as 1935. White collar employees are considered highly educated as compared to blue collar. Less physical activity among white-collar workers has been thought to be a key factor in increased life-style related health conditions such as fatigue, obesity, diabetes, hypertension, cancer, and heart disease. Also, working at a computer could potentially lead to diseases associated with monotonous data entry such as carpal tunnel syndrome. Workplace interventions such as alternative activity workstations, sit-stand desks, and promotion of stair use are among measures being implemented to counter the harms of sedentary workplace environments. The quality of evidence used to determine the effectiveness and potential health benefits of many of these interventions is weak.

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Manual labour

Manual labour (in Commonwealth English, manual labor in American English) or manual work is physical work done by humans, in contrast to labour by machines and working animals. It is most literally work done with the hands (the word manual coming from the Latin word for hand) and, by figurative extension, it is work done with any of the muscles and bones of the human body. For most of human prehistory and history, manual labour and its close cousin, animal labour, have been the primary ways that physical work has been accomplished.

Col bleu (classe sociale)

vignette|252x252px|Un travailleur d'une profession de col bleu Col bleu est un terme utilisé pour désigner des travailleurs exécutant des tâches manuelles, par opposition aux cols blancs qui représentent les travailleurs de bureau. Un col bleu est un membre d'une classe ouvrière qui exécute un travail manuel et gagne un salaire horaire. Les cols bleus se distinguent des cols blancs, dont le travail n'est pas considéré comme manuel. Cependant, certains employés sont également désignés souvent sous le nom de cols bleus.

Travail

Au sens économique usuel, le travail est l'activité rémunérée qui permet la production de biens et services. Avec le capital, c'est un facteur de production de l'économie. Il est essentiellement fourni par des employés en échange d'un salaire et contribue à l'activité économique. Le processus d'entrée et de sortie de l'emploi se fait par le marché du travail. Le travail non rémunéré joue un rôle non négligeable dans la production nationale.

Algèbre linéaire : déterminants et applications MATH-111(a): Linear Algebra

Explore les déterminants, l'invariance de similarité, la formule de Cramer et les interprétations géométriques dans les matrices.