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.
Marxism
According to orthodox Marxist theory, the overthrow of capitalism by a socialist revolution in contemporary society is inevitable. While the inevitability of an eventual socialist revolution is a controversial debate among many different Marxist schools of thought, all Marxists believe socialism is a necessity, if not inevitable. Marxists believe that a socialist society is far better for the majority of the populace than its capitalist counterpart. Prior to the Russian revolution of 1917, Lenin wrote: "The socialization of production is bound to lead to the conversion of the means of production into the property of society ... This conversion will directly result in an immense increase in productivity of labour, a reduction of working hours, and the replacement of the remnants, the ruins of small-scale, primitive, disunited production by collective and improved labour". The failure of the 1905 revolution and the failure of socialist movements to resist the outbreak of World War One led to renewed theoretical effort and valuable contributions from Lenin and Rosa Luxemburg towards an appreciation of Marx's crisis theory and efforts to formulate a theory of imperialism.