The phrase "a key segment of" is correct and usable in written English.
It can be used to refer to an important part or portion of a larger whole, often in discussions about analysis, research, or components of a system.
Example: "The marketing strategy is a key segment of our overall business plan that will drive growth."
Alternatives: "an essential part of" or "a crucial component of".
Artie Bulgrin, ESPN's senior vice president for research, said this year's declines were accelerated by a key segment of viewers focused on the war in Iraq.
In aligning himself with the view that the bill is insufficiently compassionate, he is in agreement with a key segment of his party, including many Hispanic voters, that want more focus on reuniting families.
Crucially, this scheme will not only help first-time buyers but also second-steppers, a key segment of the housing market that is also in need of more support and attention".
679 (2012), Gadinis examines the SEC's enforcement efforts towards a key segment of the financial industry, investment banks and brokerage houses, in the period right before the 2007/08 financial crisis.
Put another way, insofar as anger over economic conditions motivated high turnout and approval among a key segment of Trump voters in 2016, it may be less of a motivating force in 2020.
Under the LDP, Japan would not consider membership, since the country's farmers, a key segment of the LDP's base, stand to lose the protections of tariffs on imported staples.
Had Connecticut voters had more information about exactly how Lieberman's campaign to reinvent himself as an antiwar leader was a complete sham, that key segment of the Democratic and Independent voters might not have been confused, and the election - as the poll now confirms - would have gone the other way.
A number of studies also reported that population like rickshaw pullers, internal migrant workers, truckers and fishermen are the key segment of clients of the SWs and have visited a sex worker on an average 3 4 times in the last month [ 10- 13].
In this way, retailers can tap into the key segment of consumers who buy on impulse.
7. The Alternative Reference Rates Committee is working to strengthen another key segment of the financial infrastructure.
There has been good progress in several areas, but one key segment of the industry is lagging, namely automation.
