Brexit may soon cost the UK more than its combined total of payments to the European Union budget over the past 47 years, Bloomberg Economics found.
Bloomberg said the cost of the UK's vote to leave the EU had already reached £130 billion.
A further £70 billion is likely to be added by the end of 2020, the economist Dan Hanson found.
Business confidence and investment in the UK has dipped significantly since the 2016 vote.
That means the British economy is 3% smaller than it might have been if the UK had not voted to leave the EU.
After Prime Minister Boris Johnson's election victory in December, the UK is set to leave the EU on January 31.
But business confidence and investment has dipped, and annualized economic growth has fallen to about 1% from 2%. »