Left-wing politics or leftism is the range of political ideologies that support and seek to achieve social equality and egalitarianism, often in opposition to social hierarchy either as a whole, or to certain social hierarchies. Left-wing politics typically involve a concern for those in society whom its adherents perceive as disadvantaged relative to others as well as a belief that there are unjustified inequalities that need to be reduced or abolished, through radical means that change the nature of the society they are implemented in. According to emeritus professor of economics Barry Clark, supporters of left-wing politics "claim that human development flourishes when individuals engage in cooperative, mutually respectful relations that can thrive only when excessive differences in status, power, and wealth are eliminated."
Within the left–right political spectrum, left and right were coined during the French Revolution, referring to the seating arrangement in the French National Assembly between revolutionaries and monarchists respectively. Usage of the term left became more prominent after the restoration of the French monarchy in 1815, when it was applied to the Independents. The word wing was first appended to left and right factions in the late 19th century, usually with disparaging intent, and left-wing was applied to those who were unorthodox in their religious or political views.