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.
Criticism of capitalism
Critics of capitalism, particularly Marxists, identify market instability as a permanent feature of capitalist economy. Marx believed that the unplanned and explosive growth of capitalism does not occur in a smooth manner, but is interrupted by periods of overproduction in which stagnation or decline occur (i.e. recessions). In the view of Marxists, several contradictions in the capitalist mode of production are present, particularly the internal contradiction between anarchy in the sphere of capital (i.e. free market) and socialised production in the sphere of labor (i.e. industrialism). In "The Communist Manifesto", Marx and Engels highlighted what they saw as a uniquely capitalist juxtaposition of overabundance and poverty: "Society suddenly finds itself put back into a state of momentary barbarism. And why? Because there is too much civilization, too much means of subsistence, too much industry, too much commerce".