Its not really a signal for good or bad for the economy, it's a signal for what the central bank is trying to do. You have to look at the situation to know if it's good or bad.
Raising the interest rate is an attempt to decrease inflation by slowing down borrowing. Debt loads of companies/government entities increase due to the higher interest rate.
Lowering the interest rate increases the inflation rate buy allowing more borrowing. Debt loads decrease as the inflation rate devalues debts.
The Russian economy is under severe strain with oil revenue decreasing rapidly and debts loads piling up. Inflation pressure has been extremely high for years. The central bank is trying to decrease debt by allowing inflation rate to take off again. Lowering the interest rate while inflation pressure is very high is a desperate move to try to stabilize the economy in free fall.
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