Even so, it is possible to work out the sectors that will benefit if she wins. To start with: renewable energy. 

Harris may well have distanced herself from some of the lavish spending and generous subsidies of Bidenomics – and rightly so, given how unpopular that has proved with the voters and how much money has already been wasted. But she is still far more committed to hitting net zero targets and reducing carbon emissions than Trump ever will be. 

All the companies that have been developing wind, solar and nuclear power will continue to thrive. 

In the same vein, the big microchip manufacturers that have benefited from the lavish subsidies of the last four years designed to rebuild America as a technology manufacturing centre will be able to count on plenty more free money from the White House. 

Housebuilders and materials suppliers will benefit from her plans to offer subsidies for new homes as well as the target of building more than 3m houses – a 50pc increase over current building rates. And while it may not be a huge industry yet, at least not officially, the fledgling marijuana industry will benefit from her plans to finally legalise the drug. 

Add it all up and one point is clear. Harris is the continuity candidate. She offers a watered-down version of president Biden’s programme, with an extra emphasis on reducing housing costs and with fewer inflationary spending programmes. 

The stock market says that is a winning formula, even if the polls say it is too close to call and the betting markets are calling it for Trump. It may come as a surprise on the night – but the stock market has rarely been wrong before.