Marxism encompasses an economic theory, a sociological theory, a philosophical method and a revolutionary view of social change. There is no one definitive Marxist theory; Marxist analysis has been applied to a variety of different subjects and has been modified during the course of its development, resulting in multiple and sometimes contradictory theories that fall under the rubric of Marxism or Marxian analysis. But the usual description is that, as technology changes, production of goods improves; the maldistribution of these goods results in distribution vampires called Bourgeoisie. This will set up social class battles between those who have, and those who work to produce. Marxists solve this by having government own both means of production and means of distribution. Advancement for an individual involves becoming part of the government, who own the means of both production and distribution. . Socialism likewise has many forms. Socialism is an economic system characterised by social ownership of the means of production and co-operative management of the economy. "Social ownership" may refer to cooperative enterprises, common ownership, state ownership, or citizen ownership of equity. Private ownership is limited to small goods. Advancement under socialism is limited to those who can enrich themselves through becoming heads of state-owned enterprises. . A social democratic capitalist believes in private capital and private ownership, but socialism will slowly take over the means of production and distribution, through a peaceful democratic process. This is the current economic model of Europe, and it is a "middle path" between socialism and capitalism. Advancement is through ownership of capital as well as through placement in government agencies responsible for regulation of commerce.