The study looked at how monetary policy in Nigeria affected the performance of small and medium-sized businesses from 1970 to 2015. They used factors like credit availability, interest rates, inflation, and exchange rates to see how they impacted the businesses' output. The researchers found that credit availability and inflation had a negative impact on the businesses, while exchange rates and interest rates had a positive impact. Overall, the study suggests that Nigeria's monetary policy hasn't been good for small and medium-sized businesses, and recommends that the central bank should make its policies more flexible and supportive to help these businesses grow.