In Brazil, interest rate decisions are taken by The Central Bank of Brazil's Monetary Policy Committee (COPOM). The official interest rate is the Special System of Clearance and Custody rate (SELIC) which is the overnight lending rate.
Last month Brazil interest rate was 11.25%, and the month before that it amounted to 10.75%.
Interest rate is the proportion of a loan that is charged as interest to the borrower, typically an annual percentage of the loan outstanding. When it comes to the national level, interest rate is a rate at which banks borrow money from a country's central bank.
Yes, negative interest rate can be used by the government as a monetary policy tool to stimulate economy growth.
Growing or falling interest rate can influence the country's economy, stimulate it or lower the inflation level. Even people can feel the effect of interest rate's movements — for example, if interest rate increases, loans get more expensive.