Gold will be driven underground. If you have too much gold jewelry on, they will pull you over and weight it at the airport. So, this guy would be in trouble.

In all cases where a currency has been cancelled or the confidence in government collapses to any extent, from Russia to a Zimbabwe event, the people use the currency of a neighboring country. The best thing for Europeans to do right now is to hoard U.S. dollars in cash — not euros, and not even Swiss francs. The Swiss will surrender to the demands of the EU, so I would not count on those 1,000 Swiss franc notes remaining valid for long either. The USA would find it extremely difficult to move to electronic currency. The USD remains the legal tender since 1792. It has never been cancelled and it might even spark a breakup of the USA with the Bible Belt whom is moving to secede.