I don't know, I was thinking about this last night over a beer and this morning while I was getting ready to come to work. Yes, I gamble for a living. But, I do understand the fundamentals behind what I am doing. If I lose money, it is no one's fault, but my own. Someone else was more clever, quicker or just luckier. That is the game.
However, on the other hand, I have been successful at it for 20-years in commodities, foreign exchange, money markets, fixed income, equities and now energy markets.
I have lived through several currency crashes and survived - the drop in the dollar in the 80's, the ERM crisis in 1992, the Asian crisis, the Czech currency crisis in 1997 and the Russian crisis in 1998. I was trading the entire time. Market making. Providing liquidity to the market. Smoothing the volatility. I have watched other defaults like the Argentine default from the sidelines. I have seen a few near misses like Turkey & Brazil more recently where you wonder how they managed to pull another rabbit out of the hat? I guess to keep from walking over a cliff you do not have to turn around, you just have to stop going forward?
On the otherhand, I have seen the excesses in Japan & HK worked off much more slowly. A decade of deflation in asset prices, slow to no growth and several recessions. It is not as spectacular as a currency crisis, but it is good medicine for an economy whose fundamentals get outta whack.
Most people probably are only vaguely aware that the dollar was at 0.8200 against the euro in 2000 and at 1.3670 in 2004. That is a swing of 40% (i.e. the external value of the dollar lost 40% of it's purchasing power outside the USA). I saw the yen at 80.00 and at 145 in 1995 and 1998 that is a move of 45%. Yet, in neither case did the system implode in Europe, Japan or the USA. Real wealth was created and destroyed, but most people were quite unaware about it or very passively interested because it might have effected where they took their vacation. Sometimes these asset reallocations are necessary.
So, yes, the US borrow too much money. They do not raise enough taxes to pay for their spending. Housing markets need to correct downwards. Relative to incomes, housing prices are less affordable today than they were in 1991, and that is in a low interest rate environment, so as interest rates rise, this will be a shock to homeowners. Nevermind high heating bills this winter, which I am sure many households have not budgeted for as the savings rate in the US is negative.
It is going to get painful. There is no avoiding this. And, if the government tries to borrow their way out of this coming recession it will only make America's external situation worse (i.e. higher interest rates and/or a weaker dollar). I would not rule out a euro/dollar of 1.4000 in the next 2-years and Fed funds of 6% in any case.
But, back to sub-investment grade junk bonds. There is chance of default attached to every bond by S&P, Moody's, Fitch, Dun&Bradstreet, etc. All the way from AAA to D for default. The lower the rating the greater the chance of a default. This has very little to do with the availibility of credit or liquidity, but is a mathmetical formula that measures a firm's ability to repay debt just like your own personal credit score measures how big a mortgage you can repay. Now you may have a crap credit score and your local bank may still give you a loan. That is silly, but it happens. A firm may issue debt with a really bad credit rating and if investors are foolish enough to buy their debt then they deserve to lose money.
GMAC & Ford credit have been on my radar screen for at least 3-years as their ratings continued to slide. Serious investors have been shedding their debt at each negative turn. The only ones holding their debt now are the speculators, hedge funds and a core of investors who believe naively that GM & Ford are too big to fail therefore there will always be a rescue somewhere along the line. I don't buy that line of thinking. I have seen enough defaults to know better.
However, it is very hard to protect investors from their own greed. When an Italian retail (i.e. amateur) customer buys Argentine bonds because they carry a high coupon or interest rate it is his own naive belief that the IMF or someone will never let Argentine default, except Argentine has spent roughly half of the past 200-years in technical default on their debts, then who am I to stop them? They are not a good investment. Emerging market bond traders know this. Ordinary investors should just avoid them. If Argentina defaults it has nothing to do with the health of the global economy and everything to do with their own mismanagement and prolifagy.
Did anyone seriously believe that people would keep buying SUVs forever? That Ford & GM could keep giving zero interest loans and rebates forever? That Toyota and it's competitors were just going to let Ford & GM dominate forever despite making inferior autos? That Ford & GM could borrow at will from their employees pension fund accounts and then magically make those funds reappear when their employees retired and started drawing pensions? It is criminal what these firms did. Fobbing off their pension liabilities on Delphi or on the federal government. However, it did not stop stupid investors continuing to back their idiocy by buying GM & Ford stock or investing in GMAC & Ford Credit bonds. Buyer beware. I certainly regret buying Ford stock in 2003 'for the bounce'!
So, if you think the US will default on their debt you can invest in other asset classes. But, before you do, you may want to compare the debts & deficits of the US to each country of the eurozone like Italy, Portugal, Greece, Spain & France, and you might find out that the US' deficit is no worse. You may want to consider that gasoline in the US is $2.50-3.00 versus $5.00-6.00 in Europe; that income taxes are 29% vs. 41%; that sales taxes are 3-4% vs. 17% VAT in Europe; that the US economy grows at roughly twice the pace of Europe (3.5-4.0% vs. 1.5-2.0%); you may look at the US economy with 5% unemployment vs. Europe with over 10%; and then you might consider the costs of integrating the newer members into the EU15, and the efficiency of transfering wealth from successful economies to less successful ones as a matter of policy?
There are good reasons to invest in some parts of Europe, but after you add up the sums, you might consider the size of the US' deficits against potential revenue it can raise from taxes vs. how highly Europeans already are taxed and their deficits are no better. It is your decision, but just do the math before you write the US dollar off and tell me how great the euro is. I like Europe. I have spent the past 13-years living in Austria, Germany, the UK, the Czech Republic, the Ukraine, Russia and now Cyprus. I really enjoy the quality of life & diversity of languages & cultures. However, I don't pretend that I like paying up to 50% of my income in taxes, healthcare and unemployment insurance like I had to in Germany. Mind you I have those same high costs if I move back to Canada, too. So, it is just a personal choice.
Take care of your own personal finances and urge your government anyway you can to curb their spending. I am just watching from the sidelines. It won't hurt me per se, but a lot will get hurt if the US does not mend its ways.
In the meantime, I will continue to second guess central bankers, undermine prolific governments and try to keep them honest. If I lose money, no big deal, it is someone else's gain. But, yesterday was a bad day. No one is smarter than the markets. It is very humbling.

The organized state is a wonderful invention whereby everyone can live at someone else's expense.