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Sao Paulo Mayor Fernando Haddad has termed the hike reversal a "big sacrifice".
Brazil has not seen demonstrations of this kind in more than 25 years.
The president said appointments like that of WTO chief was ensured by BRICS clout.
Tens of thousands protested in Brazil's largest cities over dissatisfaction with the high cost of living and a stalled economy.
An official blamed the delay on new safety requirements and equipment adaptations.
ArcelorMittal will invest $400 million in the Americas this year, according to the head of its Americas unit.
Finance minister Guido Mantega has said the economy is growing despite an unfavorable external environment.
Some 1.56 million to 1.97 million Brazilians aged under 18 work in hazardous jobs, according to a government study.
As Brazil increasingly sees itself as a voice of the developing nations, frictions in ties with the US has risen.
Brazil has asserted that better ties with Africa was strategic to its foreign policy.
