It's a large market for both sides, but Brexit will hurt one much more than the other. The UK exports ~50% of its goods and services to the EU. The EU exports

It's a large market for both sides, but Brexit will hurt one much more than the other. The UK exports ~50% of its goods and services to the EU. The EU exports 8% of it's good and services to the UK. The latter is in absolute terms the larger amount of goods and services, but the former is just a massive portion of total trade to have to suddenly replace or re-negotiate. Think about it this way: SMB company A has to suddenly replace 50% of its customer base. Enterprise company B has to suddenly replace 8% of it's customers. I know which one I'd rather be!