The quantity theory of money affirms that the prices determination is directly related to the amount of money in circulation. Its equation says that the amount of money multiplied by its circulation speed is equal to the level of prices multiplied by the production. So, if an expansionary monetary policy is applied, then the amount of money will grow so the equation changes, the production grows as well so the prices level. This will happen in the short run affecting the output too which grows, known as the real effect.