Monetary policy is the process by which the central bank, in Canada's case the Bank of Canada, influences the supply and demand of money in the economy, and thereby affects the level of interest rates, inflation, and economic activity. One of the main tools of monetary policy is the overnight rate, which is the interest rate that banks charge each other for short-term loans. The Bank of Canada sets a target for the overnight rate and adjusts it periodically to achieve its inflation target of 2%. By increasing or decreasing the overnight rate, the Bank of Canada affects the cost and availability of credit for consumers and businesses, and influences their spending and saving decisions. For example, if the Bank of Canada increases the overnight rate, it becomes more expensive to borrow money, which reduces the demand for loans and credit, and slows down economic growth and inflation. Conversely, if the Bank of Canada decreases the overnight rate, it becomes cheaper to borrow money, which increases the demand for loans and credit, and stimulates economic growth and inflation.

Canadian Investment Funds Course, Chapter 1: The Canadian Financial Services Industry1