Logic?

We are warned by the G20 that there will be a "Global Shock" if Britain leaves the EU.
We are also told that we couldn't survive by ourselves outside the EU in spite of our having one of the world's largest economies and more than half our trade being with countries outside the EU.

Surely these two statements contradict each other. If our economy is sufficiently large to cause a "Global Shock" as a result of our leaving the EU, surely it is strong enough for Britain to survive outside the EU? I suspect that the main shock will be to the EU's economy when they discover they will no longer get subsidies from the UK.