AAP

The Australian dollar has again threatened to fall below 82 US cents, under pressure from low oil prices and a siege in central Sydney.

Global oil prices have slid to new multi-year lows after a top OPEC official suggested that speculation largely was driving the market lower, indicating the cartel would keep output unchanged.

Gold prices have fallen, as the US dollar firms ahead of a Federal Reserve meeting later in the week.

The deficit forecast for the federal budget has blown out to $40.4 billion, with a surplus projected for 2019-20 in the mid-year economic and fiscal outlook.

US-based logistics giant Iron Mountain is bemused with Australian data management business Recall Holdings’ dismissal of its $2.2 billion takeover offer.

The share market has fallen for a fifth consecutive session amid lower trading volumes due to a siege in Sydney’s CBD.

Trading on Australia's key financial markets has been hit by the hostage crisis in Martin Place.

The corporate watchdog has cancelled the registrations of more than 400 self managed super fund auditors who failed to pass a competency test.

Newcrest Mining expects to save up to $US2.5 billion by splitting the development plan for a mine in Papua New Guinea into two stages.

The board of global drinks giant The Coca-Cola Company has approved a proposed $US500 million ($A540.98 million) investment in Australian subsidiary Coca-Cola Amatil's Indonesian business.

Supermarket giant Coles has apologised and offered refunds to suppliers after admitting it crossed the line with many of them.

The Australian share market has opened sharply lower following another slide in oil prices.

The Dow has plummeted more than 300 points as US stocks took cues from a rout in European equities following another big drop in oil prices.

The Australian dollar threatened to break its four-and-a-half-year low after oil and gold prices fell at the end of last week.

Gold has locked in a three-day losing streak as some investors chose to sell their holdings ahead of next week's Federal Reserve meeting.

Another big-four lender has announced a reprieve for drought-hit farmers in NSW and Queensland.

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More cuts, new spending and a deeper deficit will be spelt out in the federal government's budget update next week.

The share market has fallen for a fourth straight day after Reserve Bank governor Glenn Stevens scotched expectations of interest rate cuts early in 2015.

Westpac expects the economy to improve in 2015, fuelled by further interest rate cuts and a lower Australian dollar.

A single contractor has won a $66 million tender to book $2.1 billion worth of federal government travel over four years.

The world's biggest drilling services company, Boart Longyear, says higher costs and lower prices are weighing on earnings but revenue is expected to pick up.

The Australian share market is lower, pulled back by weakness among the major banks and the resources sector.

Construction giant Leighton Holdings will sell its John Holland subsidiary to a Chinese firm for around $1.15 billion.

US stocks have advanced following an upbeat retail sales report, but the gains were limited by concerns over the rapid fall in oil prices.

The Australian dollar has plummeted to fresh four-and-a-half-year lows after the head of the Reserve Bank said he wanted the currency to fall to 75 US cents.

US oil prices have tumbled below $US60 a barrel for the first time since July 2009, taking the shocking loss since June to about 44 per cent.

Gold futures have closed lower as upbeat US economic data bolster the US dollar and fan expectations of tighter monetary policy from the Federal Reserve.

Manufacturer Bradken is opening its books to its private equity suitors and fielding takeover interest from other parties.

Sharp falls by resources companies caused by further weakness in commodity prices have driven the share market lower.

A Nationals senator wants to make it illegal for banks to foreclose on drought-hit farmers.

Big businesses already raise a hefty chunk of their funds from the bond market rather than banks - and many will go further down that road in 2015.