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Who’s Going to Buy Your Debt, Mr. President?
... Britain was warned by Standard & Poor’s Ratings Service that it may lose its coveted triple-A credit rating, triggering a drop in U.K. bonds and sparking global fears about the consequences of massive debts being incurred by the U.S. and other major nations as they try to dig out from the economic crisis.

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The announcement quickly sent waves across the Atlantic. Investors initially dumped U.K. bonds and the pound, heading for the relative safety of U.S. Treasurys. But within hours, worries about an onslaught of new U.S. bond sales and the security of America’s own triple-A rating drove down the prices of U.S. Treasurys.

The yield of the benchmark U.S. 10-year bond, which moves in the opposite direction to the price, rose by 0.15 percentage point from Wednesday to 3.355%, its highest level in six months.

The relative gloom about the U.K. and the U.S. was apparent Thursday in the market for credit-default swaps, where investors can buy and sell insurance against sovereign defaults. Five years of insurance on $10 million in U.K. debt jumped to around $81,000 a year, from $72,000 earlier in the day. U.S. debt insurance cost the equivalent of $37,500 — in the same range as France at $38,000, and Germany at $35,000....

...China is growing more picky about which American debt it is willing to finance, and is changing laws to make it easier for Chinese companies to invest abroad the billions of dollars they take in each year by exporting to America. For its part, the United States is becoming relatively less dependent on Chinese financing.

…Financial statistics released by both countries in recent days show that China paradoxically stepped up its lending to the American government over the winter even as it virtually stopped putting fresh money into dollars.

This combination is possible because China has been exchanging one dollar-denominated asset for another — selling the debt of government-sponsored enterprises like Fannie Mae and Freddie Mac in a hurry to buy Treasuries. While this has been clear for months, new data shows that China is also trading long-term Treasuries for short-term notes, highlighting Beijing’s concerns that inflation will erode the dollar’s value in the long run as America amasses record debt....