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In this task, you are given an article. Your task is to summarize the article in a sentence.
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The business lobby group said a study found that a vote to leave would have "negative echoes" lasting many years.
It said the cost could be as much as 5% of GDP and 950,000 jobs by 2020.
But Vote Leave chief executive Matthew Elliott said employment and the economy would continue to grow after an exit.
He said that "even in the CBI's skewed choice of scenarios for exit" it was "forced to admit" that would happen.
CBI director general Carolyn Fairbairn said an EU exit following the referendum on 23 June "would be a real blow for living standards, jobs and growth".
She said: "The savings from reduced EU budget contributions and regulation are greatly outweighed by the negative impact on trade and investment.
"Even in the best case this would cause a serious shock to the UK economy."
In its report for the CBI, accountancy firm PwC examined what would happen if Britain signed a free trade agreement with the EU within five years of an exit vote or decided to conduct business as a member of the World Trade Organisation. In that instance, it said negotiations could "prove more difficult and prolonged".
The firm forecast that if Britain voted to stay in the EU, the average annual GDP growth between 2016 and 2020 would be 2.3%.
This compares with 1.5% economic expansion under a Free Trade Agreement (FTA) and 0.9% if the UK struck a deal as a WTO member, PwC said.
Ms Fairbairn told Radio 5 Live: "You might call it an uncertainty shock over the next five years that reduces the GDP of the economy by 3%, [and] delivers an increase in unemployment of about 500,000.
"And even in the longer run the economy would stay smaller than it would have been otherwise."
However, Vote Leave's Mr Elliott said that average annual economic growth in both exit scenarios between 2020 and 2030 would equal - and in some cases beat - GDP forecasts for the UK remaining in the EU.
If the UK remained in, PwC said GDP was forecast to expand on average by 2.3% between 2021 and 2025 and between 2026 and 2030.
In a free trade scenario, PwC said average annual growth would be 2.7% between 2021 and 2025, and an average of 2.3% in the years to 2030.
In a WTO agreement, average annual GDP growth would be 2.6% between 2021 and 2025 and 2.4% up to 2030, forecast PwC.
By 2020, PwC said it expected employment to reach 32.2 million but it could fall by 550,000 in the free trade scenario and by 950,000 in a WTO agreement.
Vote Leave said that jobs would still be created under either of the scenarios presented by PwC. By 2030, if Britain stayed in the EU, employment would reach 34.5 million, Vote Leave said.
If the UK left and made a free trade deal, employment would reach 34.1 million, or would hit 33.9 million in a WTO deal by 2030, according to calculations by Vote Leave.
The PwC report said there was likely to be "significant economic and political uncertainty" if Britain voted to leave because it could take at least two years before the UK clarified its relationship with the EU over trade and other matters.
Ms Fairbairn said: "The European Union has no particular rush to want to do a deal with us, and we'd have to renegotiate 50 deals around the world that are currently run through the European Union."
However, Alan Halsall, a member of Vote Leave's campaign committee, disputed the assessment on how long it would take Britain to strike a deal on trade with EU members. "They said it would take five years - we don't think so."
Britain's biggest business lobby group released the report by PwC after a recent poll found that 80% of members questioned in a survey wanted to remain in the EU.
The CBI said it would not align itself with either side of the debate but, following the result of the survey, has set out the economic case for Britain staying within the EU.
Other organisations have modelled the potential impact on the UK of leaving the EU.
Open Europe estimated that if Britain were to leave the EU the economy could be 2.2% smaller in 2030 in its worst case scenario, or 1.6% bigger in the best case scenario. That's compared with the size of the economy if the UK were to stay in.
However, Open Europe said the more likely range was between -0.8% and +0.6%.
The Centre for Economic Performance looked at incomes per head in the UK.
It estimated that by 2030 income per capita could be between 1.3% and 2.7% less if the UK were to leave the EU, compared with staying.
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A UK exit from the EU would cause a "serious economic shock", potentially costing the country Â£100bn and nearly one million jobs, according to a report commissioned by the CBI.


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The Becket Casket loaned from the Victoria and Albert (V&A) Museum will be exhibited at the Museum of Somerset.
V&A curator, Kirstin Kennedy, said: "It's gives people the opportunity to share our objects and inspire people with them."
St Thomas Becket was killed in 1170 by knights from Somerset and Devon who were followers of King Henry II.
Head of museums for the South West Heritage Trust, Steve Minnitt said: "The casket has special significance for the West Country.
"Three of the four knights involved in Becket's murder had close West Country associations.
"Richard le Breton, who struck the fatal blow, held land at Sampford Bret and Reginald Fitzurse was a landowner in Williton where he lived for a time. William de Tracy was feudal baron of Bradninch, near Exeter."
The casket was made in France in 1180 and is about 30 cm high and 30 cm wide.
Becket rose in favour with King Henry II and was appointed Archbishop of Canterbury in 1162.
But his friendship with the king did not survive and on 29 December 1170 he was murdered in Canterbury Cathedral.
There was outrage throughout Europe over his murder and Becket's tomb became a place of pilgrimage.
His relics became highly sought after and some were placed in caskets - this particular object is the earliest and largest known casket that survives.
The casket will be on display until 2 April.
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A casket depicting the murder of the Archbishop of Canterbury in the 12th Century is going on display in Taunton.


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The permanent facility would provide a space for young people and volunteers to gain skills in food, farming and conservation, the trust said.
Currently people are trained in a temporary classroom at Gosling Sike Farm in Houghton near Carlisle.
It is hoped the project will safeguard the future of the county's wildlife.
Development officer Michelle Waller, said: "There is an important role for Cumbria Wildlife Trust to play in passing on knowledge and skills to the future guardians of wildlife in Cumbria.
"The current skills gap in conservation is huge, yet opportunities for people to access these skills have been disappearing over recent years. Gosling Sike Farm is an opportunity to change this."
The trust said it needs to raise a total of about £1m for the construction and running of the building.
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Cumbria Wildlife Trust has unveiled plans for a £700,000 training centre in a bid to fill a "huge gap" in conservation skills.


