"Central banks make outsize profits when they print high-denomination notes, like €500 bills, which criminals prefer." The CSM on how black markets and currency markets benefit each other. "The demand is high because it is easier to conceal large amounts of money with higher notes. The Euro produces the highest, which attracts international demand as well as within the EU. So, the central bank is profiting by creating money at little cost and selling it back for high premiums. This profit contributes to the central bank’s solvency and therefore helps in preventing a banking crisis."