Neoliberalism or neo-liberalism refers primarily to the 20th-century resurgence of 19th-century ideas associated with laissez-faire economic liberalism. Those ideas include economic liberalization policies such as privatization, austerity, deregulation, free trade and reductions in government spending in order to increase the role of the private sector in the economy and society. These market-based ideas and the policies they inspired constitute a paradigm shift away from the post-war Keynesian consensus which lasted from 1945 to 1980.
English-speakers have used the term "neoliberalism" since the start of the 20th century with different meanings, but it became more prevalent in its current meaning in the 1970s and 1980s, used by scholars in a wide variety of social sciences as well as by critics. Modern advocates of free market policies avoid the term "neoliberal" and some scholars have described the term as meaning different things to different people as neoliberalism "mutated" into geopolitically distinct hybrids as it travelled around the world. As such, neoliberalism shares many attributes with other concepts that have contested meanings, including democracy.
The definition and usage of the term have changed over time. As an economic philosophy, neoliberalism emerged among European liberal scholars in the 1930s as they attempted to trace a so-called "third" or "middle" way between the conflicting philosophies of classical liberalism and socialist planning. The impetus for this development arose from a desire to avoid repeating the economic failures of the early 1930s, which neoliberals mostly blamed on the economic policy of classical liberalism. In the decades that followed, the use of the term "neoliberal" tended to refer to theories which diverged from the more laissez-faire doctrine of classical liberalism and which promoted instead a market economy under the guidance and rules of a strong state, a model which came to be known as the social market economy.