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...

To explore how speculative trading influences prices in financial markets, we conduct a laboratory market experiment with speculating investors (who do not collect dividends and trade only for capital gains) and dividend-collecting investors. Moreover, we operate markets at two different...

To explore how speculative trading influences prices in financial markets we conduct a laboratory market experiment with speculating investors (who do not collect dividends and trade only for capital gains) as well as dividend-collecting investors. We find that in markets with only speculating...