The Merval stock index was down nearly 7 per cent in midday trading after Argentina walked away yesterday evening from talks in New York, where a court-appointed mediator led negotiations with US hedge funds demanding some USD 1.5 billion.
Shares had rallied yesterday when a group of private Argentine bankers announced it would offer to buy up the disputed debt.
Such a deal would have enabled Argentina to make a late interest payment owed to a separate group of bondholders, which would have allowed it to avoid default.
Olaiz said some investors may also have been spooked by Economy Minister Axel Kicillof's sharp criticism of the hedge fund investors, raising worry the dispute is far from resolution.
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Speaking to reporters after the collapse of talks, Kicillof repeatedly referred to the investors as "vultures" and called their demands "extortion."
The default did not seem to rattle global markets, largely because investors have been well aware of Argentina's problems since its record USD 100 billion default in 2001. Also, traders had been preparing for a worst-case scenario before the talks fell apart, and many still hope a deal will be struck soon.