The Brexit vote will cost the U.K. up to $338 billion in lost merger-and-acquisition (M&A) activity by 2020 and the global economy up to $1.6 trillion, law firm Baker & McKenzie said on Monday.

“An active M&A market is all about confidence and credibility,” Michael DeFranco, global chair of M&A at Baker & McKenzie, said in a report.

“To restore that confidence the U.K. government will need to get to grips with the enormous challenge of negotiating a new trading relationship with the EU as quickly as practically possible. Otherwise we move into more dangerous territory,” he added.

CNBC