The phrase "a captive pool" is correct and usable in written English.
It can be used in contexts related to finance, marketing, or resource management, referring to a group of individuals or resources that are restricted or limited in some way.
Example: "The company decided to target a captive pool of customers who had previously shown interest in their products."
Alternatives: "restricted group" or "limited audience".
That creates a captive pool of buyers.
It also does not have a "captive pool of funds" to draw from, he said.
The school systems of the period were the richer because they recruited from a captive pool that contained many of the best women graduates from our universities.
Not only has he shrugged off his own responsibility in the matter, he gets to keep a captive pool of kids to peddle.
One of the biggest myths currently being put forth in opposition to trans equality is that GRA reform will lead to a free-for-all in the prisons, with sex offenders able to gain unfettered access to a captive pool of vulnerable women.
Mr. Bromwich has also been quick to recognize the problems caused by having such a small and captive pool of inspectors.
Without that captive pool of available money to help it finance the deficit, the Government may be forced to pay sky-high interest rates on its bonds, raising the cost of borrowing all around.
Meanwhile, out back by the swimming pool, Bora is regaling a captive audience with reminiscences on the glory days.
They discussed the impact of the loss of this one animal's potential contribution to the reserve gene pool, which is essentially what a captive population of this critically endangered species represents.
The clients probably can't migrate their captives to another manager, because (1) probably no captive would want to take on such a captive, and (2) those captives probably still require a risk pool to work, and it is extremely doubtful under the circumstances that even if another captive manager took them on that they would allow them into the risk pool.
In South Africa, a captive bottlenose dolphin named Daan had watched divers cleaning algae off his pool's windows.
