The phrase "a vast sector" is correct and usable in written English.
It can be used to describe a large area or segment of a particular field, industry, or domain.
Example: "The technology industry encompasses a vast sector of innovative companies and startups."
Alternatives: "a large segment" or "a wide area".
It is an engine of growth in the underworld of the city's informal economy, a vast sector with an astonishing volume of supply.
While the exemption approved on Thursday would cover a vast sector of the banking industry, those institutions control only about 20percentt of the roughly $14 trillion in assets held by commercial banks.
In fact, there is a vast sector of the population that, though marked by an intrinsically inferior proficiency in any number of arenas, enjoys an unearned sense of confidence.
But gun manufacturers aren't a vast sector.
Jeremy Rifkin's extremely gloomy--and incorrect--answer is that the central government will have to support a vast sector of social work because jobs will disappear.
Now, it is true that France lives with high unemployment in a depressed euro zone; that it is more vassal than partner to Germany these days; that it is chronically divided between a world-class private sector and a vast state sector of grumpy functionaries; that its universalist illusions have faded as its power diminishes; and that its welfare state is unaffordable.
The government allocated $13m to the task on 15 July, prompted by the fact that the private sector in the Ivory Coast is dominated by micro-enterprises and a vast informal sector, according to the finance ministry.
"We've had enough of a window of certainty or stability where we now have a vast manufacturing sector in this country that has been built over the past five or seven years," Salerno said.
There's another pie-growing aspect, he thinks, within the vast sector of teenage boys who love computer games.
Pointing to the vast sector of the publishing industry built around weddings - engagement announcements in newspapers, bridal magazines and the like - Ms. Ephron predicted that Huff Post Divorce would generate a lot of interest from readers.
Free market economics, whose rules of supply and demand we so conspicuously ignore in this vast sector of the economy, make simple herbs and plant extracts or simply produced chemicals worth many millions of pounds per tonne.
