Pro-EU demonstrators wave an mixed EU and Union flag as they protest against Brexit, outside of the Houses of Parliament in central London on June 11, 2018. - After a rollercoaster week of Brexit rows within her government and with Brussels, British Prime Minister Theresa May will on Tuesday seek to avoid another setback in a long-awaited showdown with parliament. MPs in the House of Commons will vote on a string of amendments to a key piece of Brexit legislation that could force the government's hand in the negotiations with the European Union. (Photo by Daniel LEAL-OLIVAS / AFP)        (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
DANIEL LEAL-OLIVAS/AFP/AFP/Getty Images
Pro-EU demonstrators wave an mixed EU and Union flag as they protest against Brexit, outside of the Houses of Parliament in central London on June 11, 2018. - After a rollercoaster week of Brexit rows within her government and with Brussels, British Prime Minister Theresa May will on Tuesday seek to avoid another setback in a long-awaited showdown with parliament. MPs in the House of Commons will vote on a string of amendments to a key piece of Brexit legislation that could force the government's hand in the negotiations with the European Union. (Photo by Daniel LEAL-OLIVAS / AFP) (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
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(CNN Business) —  

The United Kingdom has taken a step towards securing a Brexit deal with the European Union. For businesses, the agreement would deliver much-needed certainty about the next two years.

Prime Minister Theresa May said Wednesday that her cabinet supported the deal, but she must still push it through a divided parliament. If she does, executives and investors will at long last have a road map.

“This is a decisive step which enables us to move on and finalize the deal in the days ahead,” May told reporters following a marathon cabinet meeting. “It is a decision that is firmly in the national interest.”

But the resignation of key UK government ministers on Thursday underscored the difficulty of gaining parliamentary approval for the deal. The pound dropped sharply against the US dollar following the resignations, weakening as much as 1.8%.

Here’s what the deal — should it survive — would mean for business, markets and the economy.

Business

Companies in Britain and the European Union have spent months preparing for a chaotic Brexit. Their biggest fear is a scenario where the United Kingdom crashes out of the European Union, leading to new trade barriers.

That risk hasn’t been completely eliminated and companies remain cautious. Still, business groups including the British Retail Consortium welcomed news of a potential deal.

“It is vital that we avoid the cliff edge of no deal in March 2019 as this could immediately lead to consumers facing higher prices and reduced availability of many everyday products,” said Helen Dickinson, the industry group’s chief executive.

Key manufacturing firms also cheered the emergence of a deal.

“My gut feeling is we need to get behind it and we need to make this deal work. What we need is certainty,” Juergen Maier, UK CEO of German engineering giant Siemens (SIEGY), told BBC Radio.

The deal includes a transition period during which most trading rules for companies in Britain will remain the same. A joint declaration published Wednesday said that agreement had been reached on a close relationship on trade in financial services, and broad cooperation on transportation and energy.

But businesses have also been warned to prepare for a scenario where the deal falls through.

“We still urge business to continue preparing for both a deal and no deal scenario until the deal is ratified,” said Andrew Gray, head of Brexit at PwC.

One more problem: The deal only covers the divorce terms, and doesn’t give businesses much clarity about a future trading relationship between the United Kingdom and its biggest trading partner following the transition.

The joint declaration said that negotiations had been “particularly challenging” on how future trade in goods would be conducted.

Markets

The pound has been volatile since Brits voted to leave the European Union in June 2016, and it’s still trading almost 14% lower than on the day of the referendum.

Analysts said it would strengthen following a deal.

“If the deal as described in the press were to pass into law, both [the pound] and [the euro] would benefit,” Kit Juckes, a strategist at Societe Generale, wrote in a note to clients.

Kallum Pickering, a senior economist at Berenberg bank, said the pound would likely jump higher in two stages, along with government bond yields and shares in companies that do business in Britain.

He expects the first increase once the UK parliament has approved the divorce deal, which could happen in December, and the second during the following year as investors update their outlook for the United Kingdom.

Karen Ward, a market strategist at JPMorgan Asset Management, said that investors were still “most nervous” about the deal getting through parliament. But she expects it to be approved.

“Going into next year we expect business investment to experience a relief rally and higher sterling to depress inflation and lift real wages so consumer spending would also accelerate,” she wrote in a research note.

If the deal fails and Britain crashes out of the bloc, S&P estimates the pound will slump 15% against the dollar.

Economy

Economists say a Brexit deal would boost the beleaguered UK economy.

“While the long-term risks to UK potential growth from Brexit loom large, the prospect of a deal presents considerable upside potential for the UK economy over the medium-term,” Pickering said.

Berenberg estimates that a deal would lift economic growth to 2% in 2019, from 1.3% this year.

The UK economy slowed sharply following the Brexit vote, but it has avoided slumping into recession. Investment also slumped dramatically.

A chaotic Brexit, without a deal, could sink the economy into a prolonged recession, S&P warned last month.