What makes you think it's a good idea?
Excellent question. Why is the EU a good idea?
Why did American companies gain global dominance in the 20th century, while British companies declined? American companies had an unfair advantage: a much larger home market. They could grow larger and wealthier before having to break into export markets.
The answer: join a European single market. A single market means much more than just an absence of trade tariffs of course. For the whole of Europe to be a British company's home market, you need common standards and regulations. Yes, even regulations about bendy bananas - you don't have a single market if different regions have different grading rules for agricultural produce. To create and enforce the standards and regulations, you need a legislature and courts.
A vote to leave was a vote to cut British companies off from seven eighths of their home market. I don't think you need to be an economist to work out that's going to be bad for all of us who work for those companies.
Biting the hand that feeds IT
