This book, which is the product of an eminent student and his supervisor, is intended for use for all those studying economics, finance and statistics.It is also useful for business students studying time series analysis. The aim of this book is to familiarize the readers with the modelling of the Currency in Circulation and basics of time series models used in modelling the Currency in Circulation. The book has been written in such away that readers do not require any background to understand the topics in the book.