Which currency denomination has the smallest number in circulation?

Typically, in many countries, the smallest currency denomination in circulation is often a coin, such as a penny or a one-cent coin. However, the actual smallest denomination can vary based on the country’s monetary policy and economic conditions. In recent years, some countries have phased out their smallest denominations due to low purchasing power and high production costs. For example, in Canada, the penny was officially discontinued in 2013, which reflects a trend in some economies to reduce lower-value coins.