"prosperous class" is a correct and usable phrase in written English.
You can use it when describing a group of people who are financially successful and have a higher social standing. Example: "The wealthy businessman was born into a prosperous class and never had to worry about money in his life."
"It's the entire prosperous class of Pakistan.
As a result, their babies were 70% more likely to be born dead than those born to mothers in the most prosperous class.
The enormous increase in landownership among Africans in the postindependence period also helped to create a modestly prosperous class that was anxious to avoid revolutionary change, while the powers vested in the presidency made successful opposition an unlikely prospect.
The novel as a literary form matured alongside this increasingly prosperous class with leisure time for reading, but in the mid-19th century, the genre of realism took a scalpel to its hypocrisies, the contradictions of middle-class sexuality foremost among them.
In his book In the Wake of the Plague, Norman Cantor suggests that "the Black Death accelerated the decline of serfdom and the rise of a prosperous class of peasants, called yeomen, in the 15th century".
The three-day siege of Mumbai, which ended a week ago, was a watershed for India's prosperous classes.
Instruments were more important than theories (Watt began as an apprentice instrument maker) and easily acquired by the newly prosperous classes.
This is an intriguingly deadpan, almost unclassifiable satire of power relations, a subversive reverie about the prosperous classes in any city and their fear of what lies beneath.
But the new catechism, as practiced by Republican policymakers for decades now, has amounted to little more than money printing and deficit finance — vulgar Keynesianism robed in the ideological vestments of the prosperous classes.
Like Child, David came from a débutante background and turned to food writing only in midlife; in both cases, the unmistakable upper-crustness of the writer's voice helped reassure members of the prosperous classes that it was O.K. to enter the kitchen, previously a servants' workroom, like the laundry.
The ostensible wrangling had been about the terms of integration: Mintoff insisted that the same level of social services should be introduced in Malta as pertained in Britain, since his government, earning the wrath of the island's prosperous classes, had introduced similar levels of taxation.
