Wall Street stocks have tumbled due to unease over Greece, volatility in the bond market and worries about growth after the IMF cut its US economic forecast.
Wall Street stocks have risen following a wave of mostly solid US data and a fresh confirmation of ultra-easy money policies by the European Central Bank.
US stocks have finished lower in choppy trade, following European equities downward after a senior EU official complained of slow progress in talks to avoid of Greek debt default.
There was no explicit pointer to another interest rate cut by the Reserve Bank of Australia after its policy meeting today, where it announced it would keep the cash rate at an all-time low of 2 per cent.
US stocks rose as a busy week of economic news kicked off with Intel's announcement it will buy rival chipmaker Altera for $US16.7 billion ($A21.95 billion).
All 170 employees of troubled stockbroking firm BBY have been made redundant, as negotiations continue over the sale of the business to AIMS Financial Group.
The board of gold miner Ramelius Resources has given its approval to begin mining at the company's Vivien project near Leinster, while also announcing a $10 million facility secured with the Commonwealth Bank of Australia.
Wall Street stocks have fallen sharply on a strengthening US dollar despite news of Charter Communication's $US78.7 billion ($A100.6 billion) deal to buy Time Warner Cable.