I don't claim to be any of expert on the Greek sovereign debt, the Eurozone, the IMF, the ECB or monetary policy. This just my 0.02.
To bring back one of the buzzwords of the 2007-2010 era, "financial contagion".
Greece as an economy is a minnow compared to the major players in Europe...
but so was Thailand back in 1997 right before the Asian Financial Crisis.
Thats the insidious latent power of the contagion phenomenon.
Regardless of whether a Greek default leads to Grexit, the Euro will languish in the short-term especially against the USD and CHF.
The pressure will mount on any peripheral Europe nation with large sovereign debts to service.
To resurrect another unwelcome term, the PIIGS. In no particular order: Italy, Spain, Portugal.
We're going to find out if the CDS (credit default swap) underwriters are over-exposed, just like AIG was back in 2009. Could happen exactly like 2009 again, then it'll be global in 12 hours.
A Greek sovereign default would probably be deflationary, it will slow down Euro-denominated monetary velocity all across Europe.
Without intervention, expect to see European equities cooling off, businesses reducing inventory, putting off expansion, unemployment trending upwards. Basically, conventional deflationary spiral.
Unless...the ECB already commenced their equivalent of QE in January (
http://www.ft.com/cms/s/0/aedf6a66-a231-11e4-bbb8-00144feab7de.html), 60 billion per month already. Not difficult to envision the ECB expanding their QE to protect the integrity of the Euro zone.
As for gold & silver, who the heck even knows anymore?