The phrase "a substantial sector of" is correct and usable in written English.
It can be used when referring to a significant portion or segment of a larger group, industry, or population.
Example: "A substantial sector of the economy relies on renewable energy sources to sustain growth."
Alternatives: "a significant part of" or "a considerable segment of".
The counterargument is that ETA has survived 30 years longer than these groups because its aspirations for independence are shared by a substantial sector of the Basque population.
And, as though that was not enough, there is a substantial sector of his own armed forces which is sympathetic to the Islamic cause, and which is also rather fed up with him.
Profile While mining remains a substantial sector of its economy, tourism reigns as Nevada's chief employer.
Their hope is that mobilizing people every day, rather than waiting for large Friday protests, will wear down a government that has so far been able to hang on to support among substantial sectors of the population despite protests that have grown larger and more widespread.
More than 80% of adult slum dwellers are engaged in the informal sector which provides a means of survival for a substantial section of the workforce [ 52].
A substantial engineering sector serves the needs of the mining industry.
This volume of research activity has made medical measurement a substantial and varied sector of non-mapping photogrammetry.
Besides their political clout, hospitals are consumers of a substantial proportion of health sector resources.
A substantial proportion of public sector physicians reported engaging with four types of private clinical activities, involving different levels of public resource use, regulation, quality and prices: Private practice 'outside' public practice: medical practitioners operate or work in distinct private facilities, unconnected physically or institutionally to public sector facilities.
Under these circumstances, where the state has a large and growing private health sector, a poorly functioning government sector, and a substantial proportion of the population eligible for social welfare programmes, an innovative scheme to co-opt the private sector to provide delivery care and access to emergency care seemed like a reasonable approach [ 12].
In 2012-13, the Underground carried more passengers than ever before.Most important, however, the project's planners managed to attract a substantial amount of private-sector money.
