This book presents an alternative presentation of Modern Monetary Theory (MMT). The main thesis of this book is that when a nation has monetary sovereignty and fiat currency, government is quite flexible its methods in controlling price level through market mechanisms, as Warren Mosler - one of the founders of MMT - often states. The reason given, however, differs from typical MMT or chartalist accounts and comes more from a traditional monetarist origin. This somewhat monetarist approach allows avoiding controversies actual institutional details of monetary systems. Job guarantee come as a natural extrapolation of controls on prices - price of labor and also as the most direct price level mechanism. MMT is not incompatible with mainstream economics, though MMT does ask us to consider policy space that mainstream economics has not utilized fully. This book is a significant revision (second edition) of the original book.