This morning New Zealand has the dubious honour of being the first stockmarket in the world to open in the wake of a US credit downgrade. The first ever, that is.
Take your pick of momentous events in US history - the Great Depression, the bombing of Pearl Harbour, Bay of Pigs, Watergate, 9/11 - this is a first. Investors have never had to deal with the idea that the US is not among the most secure lenders in the world. And New Zealand investors get first crack at trying to assess the severity of it all.
So what will we do? In theory there shouldn't be any need for panic. But theory doesn't always count for much when the fear takes hold.
There are good reasons for staying calm. The prospect of the US being downgraded has been very real for weeks now. On balance, it would have been more surprising if the nation had avoided a downgrade given the political standoff that saw it get to within hours of credit default.
The downgrade does put more pressure on an already troubled American economy. It is bad news but it should not, in itself, be cataclysmic.