A general strike against public spending cuts has affected most of Argentina, where schools, banks and many shops remained closed.
Train and metro services were suspended on Thursday, with a limited bus service running.
One of the main union leaders, Hector Daher, said the 24-hour strike was a wake-up call to President Javier Milei.
Daher urged him to review some of the cuts to subsidies and social programmes.
Milei, a right-wing economist, has begun implementing comprehensive austerity measures since coming into power in December.
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He says his measures are necessary to reduce Argentina’s public deficit and control the country’s inflation rate, which is the highest in the world at nearly 300% a year.
The president criticised the strike, saying his government had already made many concessions to the unions.
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