I'm voting out. Besides the sovereignty and high immigration issues, the more I have looked into the economic issues, the less I am worried.
I am getting quite annoyed at the way the 'trade with the EU' statistics are being portrayed. Phrases used above like '49% of trade is with the EU' are very misleading to the non-economist. It makes it sound like 49% of every single pound you or I make or spend comes from trading with the EU. This is not the case.
Only roughly 30% of UK GDP comes from 'Trade in Goods and Services with another economy'. In other words, roughly 70% of what we make and do as a nation is trade (in the day to day sense of the word) with each other, internally.
So, of the 30% of our GDP comprising Trade (imports and exports of goods and services with other countries), 49% is with the EU. That is, 49% of 30%, so roughly 15% of our GDP relates to the EU. Significant, but much less scary.
And to think that the trade giving rise to that segment of GDP would simply vanish upon Brexit is nonsense: there will still be demand for the goods and services that the UK provides.
The 49% figure also seems to be an average of imports and exports: imports being 53.2% and exports being 44.6% in 2015.
With regard to our import figure, nobody in the EU will want to stop selling their goods and services to the UK and nobody puts tariffs on their own exports (that would be nuts).
With regard to our own exports, the ONS website states that the Rotterdam Effect (that some goods we transport to the Netherlands actually go elsewhere in the world and should not really count as EU Trade) exists and you can knock off 4% off our goods export figure or 2% off goods and services combined, so make the 44.6 actually 42.6%. Or to put a Brexit-positive spin on it: "57.4% of our export trade in 2015 was external to the EU". I do not think any tariffs imposed would be unreasonable given how much we import.
I wonder if some people find it hard to square our relatively small geographical size with the actual size of our economy. We have the fifth or sixth largest economy in the world - huge. We are not going to the back of anyone's trading negotiation queue. The EU can't afford to cut us dead. Nobody's going to ignore the fifth largest economy in the world, now free to negotiate flexibly with other nations without 27 other countries' wildly varying needs to consider.
If I were running a Leave campaign right now I would publish two alternative maps: one of Europe and one of the world. On each, a country's size would be either squished or expanded to represent the size of its economy or its income per capita rather than it's physical size - a sort of economic 'cortical homunculus'. We'd look good on them.