Today’s benchmark index is at a three-month low of 6645.0 at 1pm.
The morning’s brief rise was more than reversed by a worse-than-expected figure on the December quarter’s business investment.
The big miners, banks and energy companies are trading lower.
But Air New Zealand rose after the company announced it was dramatically cutting the number of flights to and from Asia.
Australia is not alone in today’s market slump.
Japan’s Nikkei 225 is sliding down today following Tuesday’s nosedive.
South Korea’s Kospi 200 also opened today.
The Dow Jones Industrial Average on Wall Street is down after failed efforts to rebound overnight.
And Wall Street may not improve when markets reopen in the morning.
“I think the financial markets are very upset when they look at the Democratic candidates standing on stage making fools of themselves,” Mr Trump said.
“I think after I win, the stock market’s going to boom like it’s never boomed before.”