This book is a comparative analysis of the effectiveness of monetary policy instruments used in the Democratic Republic of Congo (DRC) from 1987 to 2018. The objective was to examine the impact of these instruments on the effectiveness of the monetary policy of the Central Bank of Congo (BCC) during this period. We hypothesised that the monetary policy instruments used in the DRC were less effective in achieving the BCC's ultimate objectives. To test this hypothesis, we used statistical and econometric methods, including correlation, causality and VAR modelling. from the seventh period onwards.It follows from our analyses that the monetary policy instruments used to reduce inflation were not effective over the entire period studied in the DRC.