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Longman Dictionary of Contemporary English
public sector
▪ About 10 percent of the private sector and 37 percent in the public sector are unionized, according to the AFL-CIO.
▪ In the public sector, scarcity is more important than price.
▪ In the 1980s Conservatives have been more likely to evaluate the mediating institutions according to whether or not they are in the public sector.
▪ Leftist labor unions and their statist allies may scream but the public sector needs pruning.
▪ Only time will tell if this is a serious effort at improving both public sector accountability and overall performance.
▪ Ronald Reagan often argued that by cutting public sector spending, we could liberate voluntary efforts from the oppressive arm of government.
▪ The private-sector contribution to these schemes was intended to be several times larger than that of the public sector.
▪ The relevance of SSAPs to the public sector has never been entirely clear.
public sector

a. Of or relating to a public sector. n. 1 Any government and all entity that are controlled or funded by it and deliver public services. 2 The area of the nation's affairs under governmental rather than private control. 3 industries or services provided or funded by the government.

Public sector

The public sector is the part of the economy concerned with providing various governmental services. The composition of the public sector varies by country, but in most countries the public sector includes such services as the military, police, infrastructure ( public roads, bridges, tunnels, water supply, sewers, electrical grids, telecommunications, etc.), public transit, public education, along with health care and those working for the government itself, such as elected officials. The public sector might provide services that a non-payer cannot be excluded from (such as street lighting), services which benefit all of society rather than just the individual who uses the service.

Businesses and organizations that are not part of the public sector are part of the private sector. The private sector is composed of the business sector, which is intended to earn a profit for the owners of the enterprise, and the voluntary sector, which includes charitable organizations.