Historically and politically, the petit-bourgeois is the key to the century. The bourgeois and proletariat classes have become abstractions: the petite-bourgeoisie, in contrast, is everywhere, you can see it everywhere, even in the areas of the bourgeois and the proletariat, what's left of them.

Summary

This quote suggests that in examining history and politics, the petit-bourgeoisie (lower middle class) plays a significant role in the modern era. While the bourgeoisie (upper middle class) and proletariat (working class) are considered abstract concepts, the petite-bourgeoisie is observable and influential in all spheres, including within the bourgeoisie and proletariat classes. The quote implies that this socioeconomic group, which comprises individuals striving for social mobility and economic security, deserves attention due to its prevalence and impact in society.