The phrase "are a prime case" is correct and usable in written English.
It can be used to indicate that something is a clear or typical example of a particular situation or phenomenon.
Example: "These recent events are a prime case of how misinformation can spread rapidly through social media."
Alternatives: "are a perfect example" or "are a clear illustration".
The legal rules of evidence, in turn, are a prime case of the latter: for these rules structure the epistemic process by which jurors arrive at beliefs about disputed matters of fact at trials.
Although Etsy is distinct from sharing economy companies (because it does not focus on sharing of underutilized assets), its more than one million sellers around the world are a prime case of microentrepreneurship - and the issues around financial inclusion.
As a symptom, if not the whole cause, of England's struggle to rediscover their World Cup-winning rhythm, Greenwood's drought is a prime case study.
Iran's nuclear program is a prime case in point: so far, neither threats nor inducements have persuaded its leaders to suspend their uranium enrichment program.
There are countless ways to know something, or someone, without firsthand evidence, and Alice, as familiar as a household god and as remote as a child star, is a prime case of cultural osmosis.
The experience of "4 Guys" underscores the challenges of creating and marketing theater, whose traditional audience is largely white, not only to different audiences but to the diversity within those audiences, the Latino one being a prime case in point.
The Caribbean series was a prime case in point.
"Women are also excellent operators and have a great view on the market, but their businesses are not being funded to the same degree". Filipp believes that Drybar is a prime case study for how investors have missed notable opportunities because of lacking gender perspective in firm leadership.
TB is a prime case of where these communities can and should be key partners.
