4Currency is the portion of the national money supply consisting of banknotes and government-issued paper money and coins that can be used as a medium of exchange in the economy. Central banks can sell the domestic currency to lower its value, called devaluation, or buy the currency to raise its value, called revaluation. Altering the exchange rates is commonly regarded as a type of monetary policy. The main advantage of manipulating exchange rates is that changes in exchange rates will have a powerful effect on aggregate demand. The devaluation of the currency can raise aggregate demand, improve the balance of payments, create jobs, and increase national output amplified through the multiplier effect. The revaluation of domestic currency helps in reducing excessive aggregate demand and keeps inflation down. The topics included in this book on currency economics are of utmost significance and bound to provide incredible insights to readers. It picks up individual topics and explains their need and contribution in the context of a growing economy. This book will provide comprehensive knowledge to the readers.