

The way I see it: as the rate of profit falls, these groups are proletarianized as finance and monopoly capital tries to pad their margins to compensate. As material conditions change, so do class interests and relationships.
The importance of class relationships under particular material conditions is exemplified by the PRC’s flag: 5 stars. 4 for the peasantry, proletariat, petite bourgeoisie, and national bourgeoisie. One large star for the Communist Party that united them.




Intelligentsia maintain a portion of the means of reproduction of society. Scholars, professors, researchers and the like. It’s important that bourgeois ideas and constructs are reproduced and reinforced to uphold capitalism, and their work requires a higher level of skill. Thus, they are historically better compensated and enjoy a higher level of privilege. Still generally workers - they don’t own the means of production.
The petite bourgeoisie on the other hand do own the means of production, and do exploit labor to make profit, but operate at a smaller scale than the large bourgeoisie and their labor remains essential to their operations. Small businesses and the like.
Both groups, along with highly technically skilled workers (labor aristocracy) have similar interests in that they have more to benefit from collaboration with large bourgeoisie and imperialist forces than most workers do. This isn’t a constant, however, as the contradictions of capitalism sharpen.