A win for Trump, 70, could take a big bite out of US stocks and the S&P 500 will fall by three to five per cent immediately if he is elected president, Citi said in a note to clients, the bank said citing its latest forecast.
A victory by Democratic nominee Hillary Clinton, 69, would not move stocks significantly, it said.
Citi's forecast is that Clinton still has a 75 per cent chance to win, despite the announcement from FBI Director James Comey that the bureau discovered additional emails that could be related to the bureau's investigation into how Clinton handled classified information.
"Heightened polarisation does not bode well for governance, regardless of who wins the election," wrote Tina Fordham, Citi's chief political analyst.
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The Brookings Institute projects a 10 to 15 per cent plunge in stocks if Trump wins.
Clinton and Trump are in a dead-heat in major polls on the final weekend before the presidential election that has the world on edge, with the two rival candidates and their surrogates scrambling through key battleground states that could prove decisive on Tuesday.
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