Fascism is always a product of economic inopportunity. Inopportunity creates a burning sense of injustice. The pie of prosperity shrinks, molders, decays. Societies begin squabbling over to whom the slices, getting smaller and smaller, growing moldier and moldier, belong.
Why Fascism is Rising Again (And What You Can Learn From It)
umair haque

The fascists find their human material mainly in the petty bourgeoisie. The latter has been entirely ruined by big capital. There is no way out for it in the present social order, but it knows of no other. Its dissatisfaction, indignation, and despair are diverted by the fascists away from big capital and against the workers. It may be said that fascism is the act of placing the petty bourgeoisie at the disposal of its most bitter enemies. In this way, big capital ruins the middle classes and then, with the help of hired fascist demagogues, incites the despairing petty bourgeoisie against the worker.

Leon Trotsky, 1934