Active money is all the coins and paper currency in the hands of the public. Due to the high demand from abroad, the majority of US cash in circulation is outside of the United States. The variable demand for cash equates to a constantly fluctuating active money total. For example, people typically cash paychecks or withdraw from ATMs over the weekend, so there is more active cash on Monday than on Friday. The public demand for cash declines at times - following the holiday season, for example.