hyperinflation

/ˌhaɪpərɪnˈfleɪʃən/
noun
  1. An extremely rapid and out-of-control rise in prices in an economy, causing money to lose its value very quickly.
    • Economists warned that printing too much money could lead to hyperinflation.
    • During hyperinflation, people needed a wheelbarrow full of cash just to buy a loaf of bread.
    • The country's hyperinflation wiped out the savings of millions of citizens.
Antonyms