If you're holding cash, I'd expect that which currency you're holding matters.

If you buy what Peter Zeihan writes, it looks as though US currency will make it through the coming times better than almost all of the others. The country is well positioned geopolitically: ocean-wide moats on two borders, good relations with bordering neighbors those are separated by forests to the north and desert to the south, self-sufficient on energy, very strong navy. Then there's demographics. The boomers are retiring and taking their funds out of high-risk funds, drawing pensions much like what's happening in the rest of the world, but the US boomers, unlike that generation in most of the rest of the world, had kids (so there will be a consumption recovery) - and the US is partnered with Mexico, which has good demographics (available workers).

Then there's the Bretton Woods treaties (US protects blue water international trade for everyone at its own cost - so long as the US gets to make security decisions). That was a good strategy for keeping most of the world out of the Soviet sphere, but as of about 30 years ago the only reason to maintain it was energy flow from the Middle East. Now that the US is a net energy exporter, there is pretty much no reason to keep paying for this - except the world goes back to the way it was pre WWII which is bad for the rest of the world.

Just a thought...