Mercantilism – Get more gold!
Classical – Do nothing and nothing will go wrong.
Keynesian – In the short run, SPEND. In the long run, you are dead.
Monetarists – In the short run, PRINT notes (following rules), In the long run, do nothing and nothing will go wrong.
Neoclassical – Whatever you do, Surprise them! or do nothing and nothing can go wrong.
New Keynesians – When jolted, PRINT! SPEND!