BUENOS AIRES (Reuters) - The International Monetary Fund said it was studying a request from Argentina to speed up disbursement of a $50 billion loan program after a collapse in investor confidence in President Mauricio Macri’s government sent the peso tumbling more than 7 percent on Wednesday.

It was the biggest one-day decline in the peso ARS=RASL since the currency was allowed to float in December 2015. It closed at a record low of 34.10 per U.S. dollar and is down more than 45.3 percent against the greenback this year, prompting massive central bank interventions.

Nerves are frayed in Latin America’s No. 3 economy as it struggles to break free from its notorious cycle of once-a-decade financial crises. The last one, which was punctuated by a 2002 debt default, tossed millions of middle-class Argentines into poverty.

The run on the peso prompted Argentina to turn to the IMF for the $50 billion credit line earlier this year. As part of the deal, Argentina’s government pledged to speed up plans to reduce the fiscal deficit.

But given the peso’s continued depreciation, which makes the country’s dollar-denominated debts more expensive to pay, investors are increasingly concerned that the IMF help may not be enough.

“We have agreed with the International Monetary Fund to advance all the necessary funds to guarantee compliance with the financial program next year,” Macri said in a televised address on Wednesday. “This decision aims to eliminate any uncertainty.”

“Over the last week we have seen new expressions of lack of confidence in the markets, specifically over our financing capacity in 2019,” Macri said.

Slideshow ( 6 images )

IMF Managing Director Christine Lagarde responded by saying in a statement that the multi-lateral lender’s staff would “reexamine the phasing of the financial program.” She said that the “more adverse international market conditions” had not been “fully anticipated” when the IMF and Argentina reached the deal in June.

“Authorities will be working to revise the government’s economic plan with a focus on better insulating Argentina from the recent shifts in global financial markets, including through stronger monetary and fiscal policies,” Lagarde said.

Argentina has $24.9 billion in peso- and foreign currency-denominated debt payments due next year, according to official data.

Speaking to reporters after the IMF statement was issued, Treasury Minister Nicolas Dujovne said the government would reduce the size of its financing program, but did not provide specifics

UNION TO PROTEST BELT-TIGHTENING

If Macri was trying to calm investors, it did not work.

Slideshow ( 6 images )

“The market is saying: ‘Just the fact that you are engaging in this conversation makes me very, very nervous,’” Daniel Osorio, president of New York-based consultancy Andean Capital Advisors, said in a telephone interview.

The peso’s decline has contributed to a jump in inflation, which hit a 12-month rate of 31.2 percent in July. In response, the central bank has hiked interest rates to 45 percent and sold more than $13 billion in reserves, including $300 million in an auction on Wednesday.

All that, combined with the budget cuts promised to the IMF that will slow down public works projects, is contributing to a recession that will result in an economic contraction of 1 percent this year, according to the government. That could hurt Macri’s re-election prospects in next year’s presidential race.

The June signing of the IMF deal reduced the need for costly bond market funding and briefly steadied the peso. The government has since announced more than $2 billion in budget savings, a process Macri promised to continue.

“We will accompany the IMF support with all necessary fiscal efforts,” said Macri, who was elected in 2015 on a free market platform after eight years of deep government intervention in the economy under previous President Cristina Fernandez.

Argentina’s biggest labor group, the CGT, said on Wednesday it will call a 24-hour general strike on Sept. 25 to protest Macri’s belt-tightening measures. Two smaller union groupings said they will go on a 36-hour strike on Sept. 24 to protest the IMF, which many blame for the 2002 crisis.

“I know that these tumultuous situations generate anxiety among many of you,” Macri said. “I understand this, and I want you to know I am making all decisions necessary to protect you.”