It not the size of the GDP that is at issue, bank runs happen out of fear. I can tell you from conversations I have had with friends (not very scientific, admittedly) that people in European countries are legitimately freaked out by this. Additionally, there may be a physical limit on withdrawals, but electronic transfers are far easier and more common in the EU. That is the real threat. If we are all lucky, tempers will cool by Tuesday.

> Laws are passed nearly on a daily basis to lower the maximum amount of "physical" money (bills) you can use to buy stuff.

Do those laws also prevent people from transferring funds into other banks or currency denominations, or purchasing gold or other liquid assets?