CLEAN : WTO warns on Brexit customs bill for exporters

The video discusses the theory of comparative advantage by David Ricardo and its implications on global trade. It highlights the potential impact of Brexit on the UK's trade relationships, emphasizing the need to renegotiate agreements to maintain preferential access. The challenges and uncertainties in trade negotiations are explored, noting that such processes can be lengthy and complex, affecting the competitiveness of UK companies.

What does the speaker imply about the duration of negotiations for trade agreements?

What is the only certainty mentioned regarding the outcome of negotiations?