The phrase "affluent groups" is correct and usable in written English.
It can be used to refer to social or economic classes that possess significant wealth or resources.
Example: "The study focused on the spending habits of affluent groups in urban areas."
Alternatives: "wealthy demographics" or "prosperous communities".
"The turnout for affluent groups has not really fallen at all".
Customer service and marketing were geared toward those four affluent groups.
Perhaps over time, the odyssey stage will come to characterize the life course of the majority of young Americans, just as adolescence began as a middle-class institution and spread to less affluent groups, but it hasn't happened yet.
The most affluent groups in society benefit disproportionally from generously subsidised university education enabling graduates to earn on average an extra $1 million during their lifetimes: raise deferred contribution fees.
The shortage of jobs has also slowed wage growth so that only workers in the most affluent groups are still gaining ground on inflation, ending a six-year streak of broad increases in buying power.
They found that most of the customers signed up to these sorts of mobile-phone schemes earn under $4 a day, rather than being from more affluent groups that already had access to other insurance options.
Domestic Chinese suppliers may focus on the less affluent groups to address their needs of lower priced pistachios.
In fact, in some cases the worst excesses are seen among more affluent groups - for example, the largest rises in alcohol consumption have been seen in the higher income groups in recent years.
Accordingly, the shares of the other, more affluent, groups have risen.
By contrast, Taiwanese immigrants typically came to California with more money and education, and they now rank among the state's most affluent groups.
However, these studies have been made predominantly in affluent groups, typically urban populations of industrialized societies.
