Who would have thought that having the same credit rating as the United States would be a cause for concern rather than celebration?
How much concern is warranted the financial markets will make clear over the next few days.
But it is worth remembering that Standard & Poor's is not telling the markets anything they don't know already.
The US Government cannot continue indefinitely to borrow 40c in every dollar it spends. The political brinkmanship of recent months and the feeble procrastination of the 11th-hour deal done a week ago give little cause to believe US political leaders are capable of rising to that challenge. This is not news.
The purpose of credit rating is to relieve investors of the need to investigate for themselves the creditworthiness of issuers of debt. If the investors are in New York and the issuers are, say, Auckland City or Meridian Energy, they are likely to take the ratings agencies' views off the shelf and rely on them.