Dow falls 167 points ahead of the first televised debate between candidates Hillary Clinton and Donald Trump.
Lower for longer is good for equity markets, one trader says.
Traders see only a 22% chance of a US Federal Reserve hike tomorrow.
The odds favour a Fed interest rate rise later in the year than next week.
Apple's iPhone 7 Plus model sells out globally in online pre-orders.
The S&P 500 Index hardly moved after three days of wild swings.
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