>This cause is usually central bank inflation I hope you misplaced your quotes because this is by no means part of the definition, nor is it true. Bad central

>This cause is usually central bank inflation I hope you misplaced your quotes because this is by no means part of the definition, nor is it true. Bad central bank policy can indirectly contribute to bubbles, but inflation and bubbles are two orthogonal concepts. >for reasons unknown Actually in a bubble the reason is almost always known. An economist friend of mine put it well: "there is always an underlying story attached to a bubble that is believable and often true". The tech bubble of 2000 for example had a true story behind it: that tech was going to change the world and mint several world-changing companies.