Value-form
The Western Left academics are nowadays very happy to talk about "varieties of capitalism", but talking about "varieties of socialism" remains almost an absolute "no-no". Most Marxists continue to believe in "only one" (Marxian) socialism: either that, or nothing at all. "Either" a society or movement conforms to the true concept of socialism, "or" it does not; and if it does not, it "cannot be" socialism. However, precisely "because" there are many different Marxist beliefs about socialism, Marxists cannot agree among themselves whether Soviet-type societies were socialist, capitalist, or something else. Some countries meet with the moral expectations which Marxists have, and others do not.Originally Marx and Engels themselves had heckled the advocates of "true socialism", but later Friedrich Engels and Karl Kautsky promoted Marxist socialism as the one and true "scientific socialism" within the Socialist International. When he was 43 years old, Lenin stated: "The Marxist doctrine is omnipotent because it is true". Lenin's Communist International (a deliberate split with the social democrats) adopted Marxist socialism as its official political doctrine.
Economic determinism
Economic determinism is a socioeconomic theory that economic relationships (such as being an owner or capitalist, or being a worker or proletarian) are the foundation upon which all other social and political arrangements in society are based. The theory stresses that societies are divided into competing economic classes whose relative political power is determined by the nature of the economic system. In the version associated with Karl Marx, the emphasis is on the proletariat who are considered to be locked in a class struggle with the capitalist class, which will eventually end with the revolutionary overthrow of the capitalist system and the gradual development of socialism. Marxist thinkers have dismissed plain and unilateral economic determinism as a form of "vulgar Marxism", or "economism", nowhere included in Marx's works.