Will business in certain industries be impacted by a new US president?

“Sell in May and go away,” is an old Wall Street adage. I first heard about it from my father, a New York businessman, on a hot afternoon back in the last century.

“The brokers and the people with real money are in the Hamptons now,” he shouted over the bedlam of city traffic as he drove us home in an un-air-conditioned Ford sedan. “They just shut down for the summer and relax. The rest of us, who are still working, might as well forget about the market, too, because nothing’s happening.” In an election year, he said, that was doubly true. Nobody but the pros paid close attention to politics until Labour Day (in September in the US).