Marx did not see Socialism as a transitional stage to Communism. In one text he distinguished two stages of Communism, but he did not label the first stage as Socialism.
China was previously state capitalist but is now a mix of state and private capitalism.
The "Big Endian" and "Small Endian" philosophies described by Jonathan Swift in "Gulliver's Travels".
Adam Smith
Reticulocytes were first described as transitional forms of red blood cells by Wilhelm H. Erb in 1865.
Japan
capitalism
Mixed Capitalism
Japan
Capitalism
Socrates
State Capitalism
The US has a form of capitalism with modest government interference with a current increasing tendency towards laissez-faire.