It's wise to own a selection of smaller gold coins. Don't buy high grade rare coins or any other coins until you get a core position in gold. Hold onto your gold and keep adding to your core position. The Japanese stop buying our debt. The slowing economy turns into recession.
Corporate profits decline.
Unemployment jumps causing personal bankruptcies to soar. Credit issuers begin to fail. The dollar plunges. Tax receipts fall causing government debt to rise. Interest rates rise.