In a week that has seen potential US military action against humble Greenland first floated, then seemingly withdrawn, the US stock market has done, well, not a lot really. It fell at the start of the week, fairly hard in fact — the S&P 500 index shed 2 per cent or so on Tuesday (Monday was a holiday in the US), marking the worst day since October. By the end of the week, however, we were back where we started, in the markets at least. So on a short-term basis, the correct course of action was: do nothing.