Illustration: Lu Ting/GT

The world's developed countries face growth and employment shortfalls, while developing countries are confronting huge challenges in adapting to increasingly volatile capital flows while adjusting their growth patterns to sustain economic development. And yet America's political dysfunction has come to marginalize these (and other) crucial issues. It is all very difficult to fathom.

The threat of a default on US sovereign debt has been lifted - for now - but the deeper problem persists: For America's Republicans and Democrats, negotiating a fiscal grand compromise appears to carry higher costs than playing a game of brinkmanship, even at the risk of default. Surely this involves a collective miscalculation of the longer-term costs.

Setting aside the external impact on the global economy, the damage to domestic stability and growth from anything other than a short-term technical default would be so severe that the political system (and both parties with it) could not withstand the backlash. Domestic and foreign holders of US Treasury bills would regard a deliberate, unforced default as a betrayal of trust.

Some are reassured by this fact, because it suggests that a real default will not happen. And that means that the fragile global economy, dependent (for now) on a single country for its main reserve currency, can withstand America's political shenanigans.

That may be true, and it may be the only practical choice in the short run. But the US pattern of decision-making (or non-decision-making) has already created additional risk. It will surely be reflected in upward pressure on interest rates, at which point the Federal Reserve will enter the picture.

Far from tapering its monthly purchases of long-term assets, one can easily imagine a scenario in which the Fed's already substantial balance sheet would have to expand even more quickly to counter the negative economic effects of an unplanned - and rapid - rise in borrowing costs. And this comes at a time when many (including me) believe that strengthening US economic growth makes an orderly withdrawal from policy-assisted growth the wise course, both domestically and internationally.

Outside the US, even a technical default would have profound effects. The eurozone still faces rebalancing and structural challenges, but it has managed to create a window of stability in sovereign-debt markets. In the case of a US default, however, it would start to attract capital inflows, causing the euro to rise, adding to already-substantial headwinds to growth and employment, and making recovery in its damaged peripheral economies nearly impossible.

China and other sovereign holders of US debt face capital losses over and above those implied by the inevitable appreciation of their currency. One is reminded of the external consternation expressed during the 2008 crisis at the possibility of a default on debt carrying an implicit government guarantee.

In March 2009, Zhou Xiaochuan, the governor of the People's Bank of China, argued that the dollar's role as the main international reserve currency was not in the interest of the global economy or of the US itself. In an expanding global economy, the supplier of the reserve currency is pushed to run current-account deficits - and hence toward a leveraged-growth model that systematically erodes its strength and independence as it becomes increasingly reliant on foreign capital and foreign asset ownership.

Now we can see that the global economy is dependent not only on the strength of the reserve-currency country, but also on its values - particularly, on its continued willingness to put critical international commitments ahead of domestic disputes. America's governance crisis has called this into question.

The long-run effects of the US default threat will be overwhelmingly negative. For starters, it will reinforce the notion that policies and policy disputes are to be conducted with a view to domestic issues and interests, independent of the systemic global effects - even as those effects grow larger.

Second, external holders of US sovereign debt will almost certainly begin to view Treasuries as risky assets and, where possible, to diversify away from them. That is not necessarily bad - wholesale dumping of US sovereign debt is highly unlikely, as that would be self-destructive for many countries, including China - but the transitions could be bumpy.

Third, the willingness to hold America's creditworthiness hostage for domestic political purposes will almost surely accelerate the decline of US influence in global economic governance and management. In the short to medium term, that decline may create a vacuum and lead to volatility, because, as many have noted, there are few candidates to replace the US.

To be fair, the trend toward diminished US influence - and, ultimately, shared responsibility for global economic governance and stability - was already underway, and in a sense is inevitable. The hope was that the transitions would be gradual and stable, with the US playing a leadership role as it has in most of the postwar period.

The author, a Nobel laureate in economics, is a professor of economics at New York University's Stern School of Business and Senior Fellow at the Hoover Institution.

bizopinion@globaltimes.com.cn

Copyright: Project Syndicate, 2013