We develop a parsimonious model of bubbles based on the assumption of imprecisely known market depth. In a speculative bubble, traders drive the price above its fundamental value in a dynamic way, driven by rational expectations about future price developments. At a previously unknown date, the...

1 Abstract -- 2 Introduction -- 3 Chapter I: Literature on the subject of excess volatility -- 4 Chapter II: Excess volatility beyond discount rates -- 5 Chapter III: Evidence of excess volatility in the Eurozone market -- 6 Conclusions.