seignorage

/ˈsiːnjərɪdʒ/
noun
  1. The profit made by a government from issuing currency, especially the difference between the face value of coins and their production cost.
    • Economists study seignorage as a source of revenue for the state.
    • The government earns seignorage when it mints new coins at a cost lower than their face value.
    • Inflation can increase seignorage because the real value of money decreases over time.