J. Kyle Bass has a knack for forecasting economic trouble. Back in 2006 the Dallas-based investor observed that there was a seemingly unstoppable market for sub-prime mortgages. But research convinced him the market was wildly overvalued, that it was a quasi-pyramid scheme built on low interest rates, inflated home prices and bundles of shaky loans made to people who couldn’t really afford the payments. Wouldn’t many of these people eventually default on their debt and cause the entire market to crash? Conventional wisdom and triple-A ratings on the bundled mortgages said otherwise, but Bass, a contrarian, remained convinced the market would implode. He bought an enormous amount of credit default swaps, an investment that would pay if the mortgages went under. And when they did, he became a very wealthy man.

Then in 2008, Bass turned his attention to the global bond market, and concluded that the bonds of a number of Euro-nations, particularly Greece, were set to fall. He again bought credit default swaps, this time against Greek bonds. When Greece restructured its debt and prompted payout to these swaps, Bass’ investments reportedly stood to pay him 650 times his original buy-in. 

Now Bass, who runs his own hedge fund, Hayman Capital Management, is predicting that Japan’s economy—the third largest in the world—will experience a financial collapse. The country’s government debt is at about 240 percent of GDP, the highest in the world. Even more critical, according to Bass, is the fact that Japan’s government debt dwarfs its annual central government revenue, which is how interest on the debt gets paid. Japan’s aging and shrinking population is also part of the problem, since fewer and fewer workers mean less and less tax revenue for the government, even as debt grows. 

What Japan desperately needs is economic growth, and Prime Minister Shinzo Abe has undertaken a plan to kick-start growth with government stimulus, which means even more debt and possibly inflation. The plan has been called “Abenomics,” and it has gotten off to a strong start, with Japanese stock markets moving sharply upward. But Bass believes it will be in vain.

“There is nothing Japan can do to avoid what is going to happen,” he told me. 

Bass is not the only one who believes Japan’s debt may lead to financial calamity. Martin Feldstein, a well known economist at Harvard, also takes a dim view of Abe’s policy, writing that if it increases interest rates on Japan’s borrowing, the government could find itself in an even more precarious situation than it is in now. 

At the heart of the matter is the question of whether the country’s debt can be repaid. Taking on debt is like traveling in a time machine to your own future, where you can slice off a piece of the wealth you expect you will have and take it back with you. The problem occurs when people (or countries) are too optimistic about their future wealth, and take on debt they cannot later repay. When this happens on an economy-wide basis, an even bigger problem occurs—a financial bubble. At some point in a bubble, people realize the over-optimism. Confidence falters and the market passes through a financial black hole.

In the case of Japan, the black hole will appear if the people and institutions that buy Japanese government bonds lose confidence in the government’s ability to repay those bonds. They will either stop buying them or demand a higher interest rate. Either way, the Japanese government could find itself in the same predicament as Greece and now Cyprus, unable to pay its bills without outside help.

If that happens, Bass stands to make another fortune. More importantly, it will serve as a warning to America, which also has a significant government debt load—nearly $17 trillion. As Bass sees it, a silver lining to Japan’s collapse is that it might send a message to U.S. leaders to take serious action to reduce deficit spending, which he sees as necessary to avoiding Japan’s fate.

“[Japan’s collapse] will shake our policy makers to their core,” he said.

The only problem with the whole scenario is that it may not come to pass. In fact, betting against Japan’s economy, which has suffered economic stagnation for years, is known in financial circles as the “widowmaker,” because so many investors have lost their fortunes making it. If no crisis of confidence occurs, if Japan continues to be able to sell government bonds at low interest rates and perhaps can coax some real growth from its economy, then the black hole may never appear. And if Japan doesn’t collapse, then U.S. government debt may not be such a cause for concern either.

At UT’s LBJ School of Public Affairs, economist James K. Galbraith evinces little worry about Japanese or, especially, U.S. debt. He calls talk of a looming debt catastrophe a well-financed, years-long propaganda campaign. He points out that investors have remained willing to buy U.S. government bonds, considering them a safe bet even in the face of rising government deficits. 

“The people with money do not believe the scare talk,” he said. 

Scare talk is a strong term, though Bass could certainly be accused of being overly skeptical, and perhaps even of having a little conspiracy theorist in him. Fearing a debasement of U.S. currency, he has hoarded 20 million nickels, figuring the coin to have a melt value above its face value. Nonetheless, predicting a major financial calamity and profiting from it is a rare and impressive feat. To do it twice, as Bass has, is astounding. If he goes three-for-three on Japan, our economic future could turn out to be much darker than people currently expect. 

At the 2012 AmeriCatalyst conference in Austin, Bass gave the keynote address. The talk ranged from history and psychology to finance and economics. He referenced charts and made his points methodically, like a professor. He spoke of “non-linearities,” “Gaussian distributions” and total global debt growing unsustainably, from $80 trillion to $200 trillion over the past decade. 

“And very few people are willing to go out there and say this,” he told the audience. “You know how this ends, right? This ends through war.”

Bass doesn’t claim to know who will fight whom, but does believe wars will be fought in the coming years due to debt, and not just small ones. It seems like an extreme statement, yet economic upheaval does have a way of tugging at the social fabric, as events in Greece and Cyprus have shown.

Bass is not afraid to take risks. Having made two fortunes in a relatively young career, he has enough wealth now that his personal material comfort is probably no longer at stake. Even if the entire global financial system collapsed, his holdings of nickels alone could keep him a millionaire. So what better way for a risk taker to go all in than to place his reputation completely on the line? That is what he has done by speaking so openly about his views with both financial audiences and the media. It is a rare and refreshing quality for someone in the normally secretive hedge fund industry. Whether it turns out to be to his benefit remains to be seen.