While the rollercoaster US presidential elections have, so far, had only a muted effect on stock markets, there was no doubt how bookmakers reacted to news of Hilary Clinton’s recent illness. Bookies reduced the odds of the Democratic candidate winning, after it emerged she had been diagnosed with pneumonia. The gap between Clinton and Republican candidate Donald Trump has also been narrowing in opinion polls. The race still seems up for grabs: at this stage in 2004 John Kerry led George W. Bush by a similar margin.