The once unthinkable prospect that US government debt might lose its AAA rating has suddenly become a real possibility. In fact, it now seems about as likely as not. The problem is not so much “can’t pay” but “won’t pay”. The US, like quite a few other countries, has some fairly serious fiscal imbalances, but they aren’t pressing in the short run, and there is plenty of capacity to raise additional revenue or cut spending so as to stabilise the ratio of debt to GDP at a sustainable level.

The problem is that the total value of outstanding debt keeps growing (this would happen even with a stable debt/GDP ratio) and the US Congress requires periodic votes to approve this. They are usually the occasion for some grandstanding, but this time the Republican majority of the House of Representatives is seriously threatening a refusal, unless the Democrats agree to massive (and still unspecified) spending cuts. The due date for raising the debt ceiling passed a while ago, but an actual default is being staved off by some sharp accounting tricks, which will apparently work until 2 August. The other day, to prove they are serious, the Repubs introduced a motion for an unconditional increase in the debt ceiling, with the express purpose of voting unanimously against it, which they did.

At this point, loud alarm bells have started ringing for the big ratings agencies, Standard&Poors and Moodys. They will have to decide, well before August, whether to downgrade US government debt and if so by how much.
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