But... let's say you live in the US and want to prepare for it anyway? The major effect would be rampant inflation, especially for goods and services that are either imported or are highly reliant on imported goods. We import very little food (although we rely on oil-based fertilizers to make it), so I do not believe that widespread chaos and street violence ("kill your lunch, chop your wood, and carry a gun" scenario) are very likely.
To protect yourself from inflation, don't focus so much on your financial assets as on your personal and professional assets. A financial bet can go wrong (what if the USD strengthens instead?), while your skills and ability to generate income will always benefit you. Develop a freelancing business and related skills - salaries adjust slowly to inflation, so you get squeezed, while as a freelancer you can adjust your rates more quickly. Also develop a lifestyle that relies as little as possible on our major imported commodity, oil - a fuel efficient car, solar panels on the roof, etc.
Gold is overhyped right now -- anyone buying gold at the moment is a fool -- and, as a rule of thumb, any commodity that people watch like a hawk (gold, silver, oil) is going to have second-order effects that aren't necessarily correlated with supply/demand and isn't a very safe bet. That said, a lot of other less-watched commodities will be the first in line as newly-printed money trickles out into the economy and fuels an artificial manufacturing boom: copper, zinc, maybe some of the catalyst metals like palladium (too volatile for me), iron/steel to a far lesser extent (again, too volatile for me). If I'd had the money at the time to follow my gut in 2008, I would've made a killing on copper alone -- and if I'd put some into platinum, one year ago, pre-auto-bailout, I'd have made a very comfortable one-year return (on the order of 250%).
Seriously don't worry. It will have to adjust sometimes to reflect the real economy and the deficit. I lived in South Africa for quite a few years. At one stage the Rand halved its value almost overnight. (Big changes happen overnight) and lost more gradually over the years. It did not affect the 'buying power' in the country though. So unless you want to get up and go to Europe keep your money invested in the US. It is a great country and the economy has a tendency to re-adjust quickly. (By the way in Europe they worry similarly about the Euro).
If you have a lot of dollars under your pillow change some to Chinese Money. At worse you can go for a holiday there!
Besides that, if the dollar becomes worthless, how will your "industry" pay for raw materials that have to be imported?
Of course, you can at least buy oil in dollars ... but what if that changes, too?
As for what to do about it - own assets that generate continual revenue streams denominated in foreign currencies. International bonds are the obvious ones, but stocks of companies that make most of their revenue abroad also work well. Paradoxically, that means the S&P 500 is a pretty good bet: most of the top American companies make most of their money outside of the U.S.
If I'm wrong: I live in the mountains have plenty of trees an axe, a gun, and a stove.
Interested readers can also read "10 Bubbles in the making" @
http://www.businessinsider.com/bubbles-in-the-making-2009-9#...